Welcome!!! PVC? I have experimented with Industrial grade schedule 80 on changing the positioning of my seat on my Water Skeeter Kickboat. It only lasted a summer before breaking. (No fat jokes guys :) ) I wiegh about 200lbs. I could not see an entire frame made from schedule 80 and live more then a couple of trips out, if that. I would have to recommend Alu. for frame material, seems to be the best choice that I have seen.

As for Trolling Motors, Yes, I have seen some great setups on the front, between the foot poles. I was in Utah at a lake called Strawberry Resevoir. (I think there is some stuff on Youtube about Strawberry). The guys there almost have to have one because of how bad the wind comes up there. It is a safety thing there. I havn't tried it, but there is really no stopping ones imagination, please post a picture when you have something setup.

What is the fishing like where you are?