Update: so, things have gone south but maybe someone can learn from my mistakes. My partner (who is a 15 year UA fitter and a damn good welder) fit the rig up and tacked everything. Unbeknownst to us until now, he forgot to weld the side support beam nearest the gas beam. The gas beam was tacked and I did all of the finish welding. So, a leak test was done and failed miserably. Couplings were all good but it was leaking out of the front beam. We were stumped. After cutting off the gas beam, we then found the problem. Problem solved? Nope. After finding more leaks and welding accordingly, we just could not get the damn gas line air tight. So, we discussed with the customer and decided the safest way is to hard pipe the line behind the beam. Couplings were cut off and small pieces were welded over the holes.
I feel like a failure but I know we tried everything we could. Safety of the customer is first and foremost so at least we can all sleep well at night.
Point of this ramble: make damn sure you and your fabricator pressure check the gas line if you are building a Brutus 10!!