Great colour, excellent finish Schmango👍
I'm pretty sure that 12V SLA will be too heavy.
It'll weigh about 2kg🤔
For comparison; my 24" Sea Scout weighs 1.98kg all up with a 3S 4Ah LiPo.
She planes very nicely with a 1000kv motor and 30mm prop.
Performance report and videos at link below.