diff --git a/compose/docker-compose-fixturenet-optimism.yml b/compose/docker-compose-fixturenet-optimism.yml
index b260900..0115341 100644
--- a/compose/docker-compose-fixturenet-optimism.yml
+++ b/compose/docker-compose-fixturenet-optimism.yml
@@ -17,6 +17,8 @@ services:
       CERC_L1_ACCOUNTS_CSV_URL: ${CERC_L1_ACCOUNTS_CSV_URL}
       CERC_L1_ADDRESS: ${CERC_L1_ADDRESS}
       CERC_L1_PRIV_KEY: ${CERC_L1_PRIV_KEY}
+      CERC_PROPOSER_AMOUNT: ${CERC_PROPOSER_AMOUNT}
+      CERC_BATCHER_AMOUNT: ${CERC_BATCHER_AMOUNT}
     volumes:
       - ../config/network/wait-for-it.sh:/app/packages/contracts-bedrock/wait-for-it.sh
       - ../config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh:/app/packages/contracts-bedrock/deploy-contracts.sh
@@ -89,6 +91,7 @@ services:
     environment:
       CERC_SCRIPT_DEBUG: ${CERC_SCRIPT_DEBUG}
       CERC_L1_RPC: ${CERC_L1_RPC}
+      CERC_L1_BEACON: ${CERC_L1_BEACON}
     volumes:
       - ../config/fixturenet-optimism/run-op-node.sh:/run-op-node.sh
       - l1_deployment:/l1-deployment:ro
diff --git a/config/fixturenet-optimism/l1-params.env b/config/fixturenet-optimism/l1-params.env
index 5353e62..4f10a54 100644
--- a/config/fixturenet-optimism/l1-params.env
+++ b/config/fixturenet-optimism/l1-params.env
@@ -10,3 +10,6 @@ DEFAULT_CERC_L1_PORT=8545
 # that are used to send balance to Optimism Proxy contract
 # (enables them to do transactions on L2)
 DEFAULT_CERC_L1_ACCOUNTS_CSV_URL="http://fixturenet-eth-bootnode-geth:9898/accounts.csv"
+DEFAULT_CERC_PROPOSER_AMOUNT="0.2ether"
+DEFAULT_CERC_BATCHER_AMOUNT="0.1ether"
+DEFAULT_CERC_L1_BEACON=http://fixturenet-eth-lighthouse-1:8001
\ No newline at end of file
diff --git a/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh b/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh
index 5146141..6e48070 100755
--- a/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh
+++ b/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh
@@ -9,6 +9,9 @@ CERC_L1_RPC="${CERC_L1_RPC:-${DEFAULT_CERC_L1_RPC}}"
 
 CERC_L1_ACCOUNTS_CSV_URL="${CERC_L1_ACCOUNTS_CSV_URL:-${DEFAULT_CERC_L1_ACCOUNTS_CSV_URL}}"
 
+CERC_PROPOSER_AMOUNT="${CERC_PROPOSER_AMOUNT:-${DEFAULT_CERC_PROPOSER_AMOUNT}}"
+CERC_BATCHER_AMOUNT="${CERC_BATCHER_AMOUNT:-${DEFAULT_CERC_BATCHER_AMOUNT}}"
+
 export DEPLOYMENT_CONTEXT="$CERC_L1_CHAIN_ID"
 # Optional create2 salt for deterministic deployment of contract implementations
 export IMPL_SALT=$(openssl rand -hex 32)
@@ -16,7 +19,7 @@ export IMPL_SALT=$(openssl rand -hex 32)
 echo "Using L1 RPC endpoint ${CERC_L1_RPC}"
 
 # Exit if a deployment already exists (on restarts)
-if [ -d "/l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json" ]; then
+if [ -f "/l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json" ]; then
   echo "Deployment directory /l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json, checking OptimismPortal deployment"
 
   OPTIMISM_PORTAL_ADDRESS=$(cat /l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json | jq -r .OptimismPortal)
@@ -68,9 +71,8 @@ if [ -n "$CERC_L1_ADDRESS" ] && [ -n "$CERC_L1_PRIV_KEY" ]; then
 
   echo "Funding accounts."
   wait_for_block 1 300
-  cast send --from $ADMIN --rpc-url $CERC_L1_RPC --value 5ether $PROPOSER --private-key $ADMIN_KEY
-  cast send --from $ADMIN --rpc-url $CERC_L1_RPC --value 10ether $BATCHER --private-key $ADMIN_KEY
-  cast send --from $ADMIN --rpc-url $CERC_L1_RPC --value 2ether $SEQ --private-key $ADMIN_KEY
+  cast send --from $ADMIN --rpc-url $CERC_L1_RPC --value $CERC_PROPOSER_AMOUNT $PROPOSER --private-key $ADMIN_KEY
+  cast send --from $ADMIN --rpc-url $CERC_L1_RPC --value $CERC_BATCHER_AMOUNT $BATCHER --private-key $ADMIN_KEY
 else
   curl -o accounts.csv $CERC_L1_ACCOUNTS_CSV_URL
   # Admin
diff --git a/config/fixturenet-optimism/run-op-node.sh b/config/fixturenet-optimism/run-op-node.sh
index 005c7e1..34d8e09 100755
--- a/config/fixturenet-optimism/run-op-node.sh
+++ b/config/fixturenet-optimism/run-op-node.sh
@@ -7,6 +7,7 @@ fi
 CERC_L1_CHAIN_ID="${CERC_L1_CHAIN_ID:-${DEFAULT_CERC_L1_CHAIN_ID}}"
 CERC_L1_RPC="${CERC_L1_RPC:-${DEFAULT_CERC_L1_RPC}}"
 DEPLOYMENT_CONTEXT="$CERC_L1_CHAIN_ID"
+CERC_L1_BEACON="${CERC_L1_BEACON:-${DEFAULT_CERC_L1_BEACON}}"
 
 deploy_config_file="/l2-config/$DEPLOYMENT_CONTEXT.json"
 l1_deployment_file="/l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json"
@@ -34,4 +35,4 @@ op-node \
   --p2p.sequencer.key="${SEQ_KEY#0x}" \
   --l1=$CERC_L1_RPC \
   --l1.rpckind=$RPC_KIND \
-  --l1.beacon=http://fixturenet-eth-lighthouse-1:8001
+  --l1.beacon=$CERC_L1_BEACON
diff --git a/stack/fixturenet-optimism/README.md b/stack/fixturenet-optimism/README.md
index 3222b5e..1463c5a 100644
--- a/stack/fixturenet-optimism/README.md
+++ b/stack/fixturenet-optimism/README.md
@@ -112,6 +112,15 @@ Inside the `fixturenet-eth-deployment` deployment directory, open `config.env` f
 CERC_ALLOW_UNPROTECTED_TXS=true
 ```
 
+Inside the `fixturenet-optimism-deployment` deployment directory, open `config.env` file and set following env variables:
+
+```bash
+# Optional
+# Funding amounts for proposer and batcher accounts on L1
+CERC_PROPOSER_AMOUNT=  # Default 0.2ether
+CERC_BATCHER_AMOUNT=   # Default 0.1ether
+```
+
 ## Start the stack
 
 Start the deployment:
diff --git a/stack/fixturenet-optimism/l2-only.md b/stack/fixturenet-optimism/l2-only.md
index a4ae95a..5db2481 100644
--- a/stack/fixturenet-optimism/l2-only.md
+++ b/stack/fixturenet-optimism/l2-only.md
@@ -64,6 +64,9 @@ Inside the deployment directory, open the file `config.env` and add the followin
   CERC_L1_HOST=
   CERC_L1_PORT=
 
+  # External L1 Beacon node endpoint
+  CERC_L1_BEACON=
+
   # URL to get CSV with credentials for accounts on L1
   # that are used to send balance to Optimism Proxy contract
   # (enables them to do transactions on L2)
@@ -74,6 +77,13 @@ Inside the deployment directory, open the file `config.env` and add the followin
   # Other generated accounts will be funded from this account, so it should contain ~20 Eth
   CERC_L1_ADDRESS=
   CERC_L1_PRIV_KEY=
+
+  # Optional
+
+  # Funding amounts for proposer and batcher accounts on L1
+  # (Accounts funded using the Admin account)
+  CERC_PROPOSER_AMOUNT=
+  CERC_BATCHER_AMOUNT=
   ```
 
 * NOTE: If L1 is running on the host machine, use `host.docker.internal` as the hostname to access the host port, or use the `ip a` command to find the IP address of the `docker0` interface (this will usually be something like `172.17.0.1` or `172.18.0.1`)