Hi, Jorgen here.
About engine vibrations, old subject in the forum but found this as inspiration: Volvo Penta MB2A 50S.
A Honda 2-cyl. 4-stroke 7.5 hp outboard + a VP drive with separate exhaust. Was installed inside the boat, weight only 29 Kg.
CC19 outboard is outside in a well, simpler. And exhaust is already solved but cooling water sensor are needed.
But if one want to sacrifice an 4-6 hp outboard, add 4 rubber cushions on a plate placed under the Bottom Covling.
Should probably be placed more submerged, and unfortunately the rig must be shorten (not long or short, instead super short).
And maybe a soundproof narrow hood at the height of the benches would be nice and becomes a separate table?
Weight? Adding weight, yes, but also removes weight from the engine + the original bracket. The same maybe.
There are problems to solve, and maybe there are serious things I missed, but the thougt attracts me.
And if someone came across a similar solution with an outboard, please let me know.
Link to a VP pdf:
https://www.fram.nl/yachts/pionier/MB2A_50S_1978_en.pdf
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