I had bonds make a custom cage for my s13 that was bolt in, 6 point, side intrusions, cams approved.
Sure it cost a tad more but its cams approved and if i ever total my car I can transfer the cage to the new shell.
The ONLY downside of having a bolt in rather then a weld in is you cant tag your cage in. (ive had a window pop out before due to flex plus poor window fitment).