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sounds like your on track.
The point of starting batteries is to dump large amps quickly to crank over the engine starting motor. Those engines spin pretty easy and sont really require the cranking amps of say a diesel.
The deep cycle also allows you to abuse it more times (drain it down or forget to charge it).
The biggest issue will be the cables and contacts. Use quality switchgear and go overkill on the cables. You can have all the amperage in the world but your resistance is in the cables and contacts.
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