The fabricator ask that I remove my carpet, take a few bolts out of the seats and leave the headliner in as he will sheild it, he said he cannot guarantee the headliner will live but he is really good, and besides the headliner hoops would be hard to get back in post cage.
As it relates to the welds and how he does it, got me, I have seen some people do it many different ways, most the work up top can be done prior to the lower part of the cage. Bottom line is that this guy does tig work on pro stock chassis cars for Jerry Bickle and does rear housings for Mittler brothers and has a long lang list of very well known customers and he came highly recommended. Is it going to be cheap? Nope, I've been down that route and for what I have in this car I want it to be perfect. Not saying that someone with far more skills than me can't do it at home. I just know my wrench truning limitations.