motor, lower unit, and composites suggestions

[tunnelvision07]

I have been looking for a boat with a bottom similar to the Allison or critchfield to convert over to a bay/flats boat. I found a 1979 15' hydra sport bass boat the other day with a pad. The boat needs a new transom and stringers also im planning on changing the top deck some what to use a center console. What are some good composite brands to use for the transom stringers and flooring? I have a omc 75 short shaft with the "nitro gear case and weisco pistons along with hustler exhaust. My concern with the engine is with the boat being not as light as a race boat would the nitro case be a good decision for this boat? and am i losing/gaining anything from the hustler exhaust? my goal with this boat is to be a good fishing boat but also look good and be somewhat fast.