[Electric Boats] Main mounting plate needs.

Hi,
As I intend experimenting, I wish to use steel for the main mounting plate for the bearing, and the motor(s). This will allow oxy-acetylene torching of slots for belt adjustment, as well as holes for decreasing the weight, and easy welding for braces and mounts etc.
My overall expected electric power might be around 3 or 4 HP.
This would supply 50% of my hull speed power requirement.
It might be prudent to overbuild on this item though, up to the total for my hull speed, 6 HP, plus a margin.
I would like opinions:
Would 3/8 inch plate work, or am I likely to need 1/2 inch?
Bear in mind I can add angle iron or ribbing to decrease flex.

Thanks,
John

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