Great minds think alike. Lol. I'm planning on doing the same. Not for sure on the fan, but I'm leaning pretty hard that way.I shoot in a lot of shallow weed beds that are a pain with a troller. What size fan are you thinking?
We go through a prop ever 2 trips on the troller from running shallow mud flats and its getting spendy doing that. I have a 9 hp high torque honda with a 2-1 reduction that was given to me. So if I decide to run the reduction ill put a 40-42" 4 blade prop with 18 degree pitch. If I go direct drive ill run a 36" 3 blade with 18 degree pitch