Summit, nice pics. Do you know the finished weight of your deck & ramp? How long is your ramp?
I took a plan which was posted a year ago and got prices and weights for the metal. The deck drawing was from Redline Engine Performance - Sled Deck, and spec'd mostly 16ga steel, 2x2 & 2x1, 4" x 1/16 plate and 1x1x1/8 angle. The supplier only had 14 ga tubing, so the weight of all metal was 304# and the price was $321 w/o tax. That doesn't include a headache rack, plywood or expandable sides.
I know the beavertail is really helpful, but if I build a deck I'd prefer not to have to duck under the tail when accessing the box. Since my truck is not lifted, I'm hoping an 11' ramp will suffice.