BTC -> Lightning diagram, feedback please

Working on an explainer diagram for the Lightning network section of using bitcoin https://www.learnbitcoin.com/journey/using-bitcoin/ Been trying to land the mental model that a channel is sidechain-shaped: Alice and Bob start on mainnet, drop into Lightning for as long as the channel is useful, settle back to mainnet at close. Two on-chain transactions, unlimited off-chain payments between. Been struggling to get this one right, feedback appreciated.