Lenny,
Looks good. I didn't think of mounting the axle outboard of the frame, but that looks good.
I've fabricated the bottom angle pieces (cut to length, drilled holes, and welded in nuts), and tack welded them to the frame side pieces, and all is well. I want to get those two side pieces done before I start welding up the rest of the frame because if it doesn't work out, I won't have waisted it all.
Keep looking at the 2000 pound axle and thinging....man I'd hate to see a 3500 pounder! This thing is big, but it has 2000 pound stamped in the side of it. Didn't know it came with them, but brake flanges are also included.