72 Suburban air ride

[Rust hole]

Looking to do air ride on my suburban. Never put one of these on before. I see porter on here a lot but they are real proud of their stuff and I don't want to wait 3 or more months. I'm sure it's great stuff but I'm ready to go now. I talked to a couple of companys and got prices, found Bc fab has the parts I want for a good price. Anybody have experience with them?

I want to keep the factory upper and lower arms for now so whats the best way to attach the bags? I read something about cutting the lowers and welding in a cup or should I just use the bolt on plates upper and lower? Also what shocks are you running? Do I need a new cross member for the back? I'll take all the advice I can get!

Sorry for all the questions, I'm just new to this and want to do it right the first time.

Thanks, Damon