Thanks, MJ...
Here's my approach and it's worked well for years...
I took the center section of bow-rail out and capped the ends...as far as putting a chair up there, it'll sure handle the weight, but I'm not sure there's room for motor in stored position and a chair, unless ya can get real creative about it...
The trollin motor you want is Minn Kota 24 volt...if you know yer gonna be in currents, you might want to consider 36 volt...the auto-pilot feature is the real-deal on these motors, as is the co-pilot wireless remote control...they sound a little "gimmicky", but trust me, after YEARS of using these things, they're "gotta haves" for me...the motor's gonna be about a grand, batteries $100 apiece and no doubt the only way to go w/multiple batteries is an onboard battery charger...just plug it in and forget it...it'll pay for itself in extending the service life of your batteries, plus they'll be hot to go all the time...good luck and keep us posted on what ya do...we like pictures, too!!...