Wow that is a tight spot, but it looks like you're getting it done. I have a similar tent I've been using for some painting, but may be smaller than yours. Mine is 10'x10'x8' and I don't think I'll have enough room to paint the cab in there.
I see that you're using the 3M PPS system. I like that system as it's pretty easy to clean up after painting.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.