bed box & cap clamps

I have no idea how to properly attach pictures, this is the best I figured out to date, hopefully the pictures show up. Weird I've attached pictures on forums over the past 20 years and now this is not working as I would suppose it would.

Wife and kids went south 7 days ago which gave me time to do some things for me

needed some sort of box in the bed to accommodate some work gear.

http://imgur.com/a/zKSyL

3/4" 4x8 maple plywood. cut out 6' x 31" top + 3 dividing walls. Sidewalls that touch bottom are spaced to fit in the groves in the bed floor.

http://imgur.com/a/lYQGR

corner bracing throughout fastened with 1" deck screws in plug cutter holes.

http://imgur.com/a/WpTMG

2' x 31" storage cubby up front with top and side access

http://imgur.com/dj3Aeth

Lots of work to do to her yet, just getting started. Just got the box on to cover things up and needed proper bed clamps.

http://imgur.com/H9NDi5W

not hardly cleaned up or painted yes, just needed solid cap clamps

http://imgur.com/L9nA5SS

a welded tab holds the clamp in a channel on bottom. Another tab on top provides a pressure point tight to the cap wall which is over the flat on the bed rail for solid downward pressure. Top plate is floating until it is clamped.

http://imgur.com/js5oO8d

now that the cap is solid I'll get the rear window latching properly, get those hydraulic arms replaced and get the light wired up.
Pete