so lets see.
Lights : 480 for the 8"
Tubing : Free... for 20' - 62 bucks: Still free no matter how you slice it
Welding : Free.... yup still free for my Heli-Arc/Tig at work
Install : yup you guessed it
In tube Wired : yup free
Ground down and prepped for powder : Free
Powder Coated : almost free, 30 bucks

( bascially the cost of 1 lb of RAL 9004 signal black plastic for the coating )
I work for an HVAC company here in SoCal, and the piping is free, my shop can weld it for me free, have the welds buffed out, prepped for free, and we do so much install of Powder coated Galvanized duct work, the guys at Orange County Plating, already give me a good deal,and I was thinking of taking my CRF450 frame to have it Gloss Black PC'd
So when they say, "you paid what?" the others probably have/had the hook up also.
So clearly you did get ripped, but then again you paid retail or more for everything.
So under 1300?
Sure I could do it easily, even if I paid for the metal
Most expensive things are the lights, take that out, i can build the bumpers for under 200 minus my time welding.
Now would I? no
I would just use a fab sheet, detail what I wanted, Height, length, light mounts, etc, Do a dry fit after 2-3 days then send it off to be Powder coated
Again not to bag on you, your bumper is probably top notch and worth what you paid, just to whom?
Good luck to you