SD-20 Aluminum Bed

[keelsidedown]

Does anyone know of an outfit that can fabricate an aluminum bed for a SD-20 saildrive to be welded into an aluminum hulled boat?

Hull is a hard/multi-chine design with a +10mm spine necessitating offset engine and transmission placement (not sure how much offset something like a sail drive would necessitate, but I'm looking to minimize it as much as possible). Ribs (50mm T profile) are spaced between 12 to 14 inches apart. In the stern area where the engine will go, they're closer to 14 inches apart.

I am also interested in alternative engine/transmission configuration that would work well with this hull.