Hi Bmerr509,
I just read through and think I'll "subscribe" if you don't mind.
I have a few thoughts if you like. Get the 90hp motor minumum. It will fit your dream boat Lund, will haul bootay on your current boat, shouldn't drink too much gas, and is a desireable hp in case you decide to sell.
Second, you mentioned seat mount options. Woodonglass has a wood box style that epoxies to the floor eliminating screw holes. I built a similar lower profile version but mine hasn't been tested. No screws = a win though.
Third and lastly, you mentioned a kicker a year ago. I wouldn't hesitste to run the older motor you mentioned if that's yours. If not, I'd go down and get an electric trolling motor and a second battery and call it a day. If you ever sold the boat you could throw the troller on amd fish. It won't set you back in your seat but it'll save you hundreds of hours on your main motor and keep the exhaust at bay. Plus you'd have a backup battery in a pinch.
Oh and have you thought about using the side panels for rod storage and leave the floor in one piece?
As someone mentioned earlier, having the front casting seat permanently fixed might block your visibility.
Just some thoughts.
Good on you for getting a bucking gun!
Nice job so far. I'm wanting an tinny more and more every day and you're not helping the itch!!!