Then add another $1000 or two or three or four to Home Depot for insulation, trim, screws, rivets, hardware, interior walls, wiring, exterior trim, glue, flooring, sealer, more screws, more hardware, and the million other things I have not thought of yet for my build. You'll be amazed at how fast a trip to the hardware store for all the small ticket items adds up. Go back up and read through Blizz's build and look at the $$ layout. Worth your time.
And a word to the wise from my own experience: If you're going to spend that kind of money to build a nice looking box, don't be cheap on some used windows that probably aren't the size you want, and definitely won't be for the correct wall thickness, and will end up looking like a homebuilt. Brand new windows built to order in the size of your choice complete with the correct trim rings for your wall and all screens, sliders, etc. will run you $150 to $250 each depending on the size and openings. I bought 4 for my trailer after learning I had wasted money on "cheap" new surplus windows. I learned the hard way that there is a difference between left side and right side, and they have to be made for your wall thickness or they will not work at all, or will need serious hillbilly rigging to make it work. Compared to the price of the build they are not that expensive to make the thing look right. I've seen too many homebuilds on racing junk that would look good except for the 1975 camper windows they grafted in.
Good luck with your build.
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