Well, after researching some new flooring, my friend didn't see any that he thought would work any better, so we went with the original. Today I got most of it installed. After a few cuts on my miter, I realized I hadn't changed the blade since putting the laminate in my basement, and bamboo burns pretty easily.
I ended up putting down some 1/4" under layment to build up over some bolt heads in the floor as well as above the rear step's flange.
I re-used the carpet trim at the rear step to finish out the end of the floor, I milled a tongue on the end and a rabbet on the bottom side to clear the base of the trim. The tongue slipped into the opening in the trim.
I ended up nailing everything with 18 gauge trim nails. I adjusted the nail gun to set the nails about 1/16" - 3/32" deep, which worked well toe nailing into the factory tongues on the side. Though I did end up with about 50 bent brads to pull out as I'd hit hard spots from time to time, but since they were in the tongue the finished faces weren't damaged. I did face nail around the edges, but those will be covered with some trim.
Now the last part I need some input on is whether to run the steps flooring perpendicular to the rest of the floor OR to try and line it up and run it the same direction as the rest. I really don't think it looks bad the way I have it laid out currently, but how would you do it?
I plan to glue this flooring down since there is no sub-floor, just fiberglass. Also all of the fiberglass will be covered with flooring (the sides and kicker).