Doubling the 3mm ply would make a better stronger stand
with a hull that narrow you may be to top heavy with a 46 on top of it
instead of turning it will just flip [:-]
don't just glue the motor stand in PUT SCREWS IN IT

The engine vib's will break the glue lose from the coro & you will have a runaway
mess



This boat was to narrow & flipped all the time its has a 46 on it