How much did the double stack portion run you?
Not sure yet on what the racks cost me. He estimated two days of labor at $65/hr, (call it 20hrs), so $1300 in labor, and there's about $5-600 in material. It'll probably be $1700 to $2k. I also had a stand for the back of the trailer made for a mast support at the back made out of 2"x2" square tubing with the same gusseted feet.
Haven't a clue yet. Hasn't been started. I want to make sure I like the dimensions of the rack before I get going on the box. If I change the rack it will effect the size of the box at the front. I also want to give it some time for idea's to stew for a bit. Rough guess though I'll have probably $2500+ into the box. It's gonna be flippin' huge, and it'll probably have to be split up into left and right pieces.