Thanks fellas.
MNhunter1 thanks for that, I had stumbled across that post in a search while doing the bowectomy. Turned out nice. My stern seating is this instead of separate seats...
http://www.iboats.com/Blast-Off-Tour...view_id.732229
Thinking of how/where to add supports ahead of time for a removable pedestal seat base, livewell/baitwell, batteries, ski pylon..... All along trying to keep access below the deck. I've surmised that i'll keep the decks' height the same as the front rise of the bow deck and seat heights so that everything stays fluid @ 9". I've purchased 1" x 3/16" AL sq tubing and 1 1/4" x 3/16" AL U channel for all horizontal runs rather than angle The tubing will be my uprights, fitting snug within the spans of the channel giving greater riveting surface by attaching from both sides where they join, imo. I also have 1 1/2" x 3/16" AL angle on hand.
I have the layout on paper, now just have to go make some noise in the hangar....come on spring!!!
Just a tidbit to pass on while I was researching structural alloy, AL 6061 has rounded corners inside and out and not sharp edges. Huhhh learn something new everyday, eh?