that's some beautiful work, man...
you were talking about on-board air in another thread... just food for thought- I knew a guy who built out a headache rack similar to yours, custom fab'd in his garage.. he is quite the welder, too... he sealed it, and it's where he stores his air... pumps that rascal up to something like 300psi, and with a drain on one end and a valveset on the other... instead of having an onboard compressor, he just topped it off and refilled it from him macdaddy shop compressor.