So I rolled the dice went and did it. Small kit from swamp runner, predator 212 motor from harbor freight, motor mount from recretec.
I took it to the reservoir last weekend for trials. Turns out it was highly maneuverable, at full throttle we hit 5.8mph, half throttle was 5.5mph and at about 1/3 throttle we were at 5.2mph. Easy to hold a conversation at half throttle and below. I had the frame, captains boxes, table/seat, cooler with PBR in the boat and a fellow boater.
Next time, we plan on taking 2 or 3 more rafts and loading them heavy to see how it pushes.
The last thing I need is encouragement