Here's a photo of the floor board install. I added 5/8" thick x about 1 5/8" deep strongbacks/stiffeners to the top of my battens to stiffen the battens and provide mounting 'Joists' for my floorboards. Because I used 3 battens per side, and they are roughly 6" apart, I was able to use 5/16" thick material for my floorboards, which should make my boat significantly lighter than most floorwise. This also dropped my floor over 3 1/2" at the middle of frame 4, allowing the seat, and therefore me, to sit lower in the boat. I'm 6'.
As to the left sidedness, pick whichever reason you want.
A) I'm left handed
B) I always dock at the cottage with the port side to the dock and want to be able to reach the dock as I come in.
C) It allows me to run the teleflex cable along the starboard side and have a very gradual bend as it turn towards the helm.
D) I didn't know any better.
As for the seats they are elcheapos that came with the donor boat I purchased for the trailer and windshield. They run about $40.00 at the boating big box stores. Mine happen to have a swivel accessory so if I'm ever towing anyone the passenger can turn around and be facing the back of the boat, a legal requirement in Ontario, Canada where my cottage is. The rear seat I made myself.
PS: The bucket seat set up should give me room for a cooler between the seats.

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This is my first, last and only boat build.
http://www.gdzipbuild.blogspot.com