Ha 1bayouboy
As for the bracket the make is a personal choice but you do want enough flotation in the bracket to handle your twins. Most of the motors out there now a days are pretty good but weight could be a issue I would stay with 4 cylinder each and try to keep it as light as poss. As for the stringers they are foam filled so you can drill a couple of holes in them and plug them up later. Most of us have not found much problems in the stringers. But the transoms have been a real issue in all older boats due to the plywood getting rotten.
Good luck
FellowShip
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My motto: Just for the Grins
