yea, it is stitch welded to the transverse beam in the middle so I don't think it will go any where even in a large side impact. They have also stitched the cage onto the inner rear tubs, I asked them to use the cage to strengthen the body as much as possible, hence the sill bars, extra stitching and front hoop being tied into the chassis rails. Hopefully it all works well.

L18_B110 is exactly right, that bar should be straight. If you do FEA on this arrangement you might find that an impact to the lower "B" pillar will cause this bar to become a hing point therefore transfering upward load to the floorpan. This could cause more damage to the shell than if a straight bar was used. The other side of the equation is that this design offers a soft crumple zone to absorb any really big g loads.
This is just for your info and is not a criticism of your cage or its fabricator as the TIG/mig work looks good in the pics.
Looks like a great project and good luck with it.

Im not worried about criticism, its the best way to learn. Surely the other horizontal bar only 400mm higher than it would cancel any weakness issues? But I can see where you are coming from. I'm really stoked about the TIG welding, I think it looks so much better than MIG (even if cost about a grand more) and I believe it forces the fabricator to spend more time on the quality and fitment of the cage.

That cage looks the goods mate! I got my cage tig welded, definitely worth the extra dollars. Is it tieing into the A + B pillars also?

Thanks man. Yea if you look at the pic form the front you can see the plates tying in the A pillar. The main hoop is tied into the B pillar so it should be pretty stiff, I have heard of people popping/cracking windows if the body is to stiff, is this true?

it's practically a space frame with a shell there just for looks... hehehe

thats a serious cage

Could always make your own Lexan windscreen if your worried about it, unsure on whether you can form it though

yea I gave them a budget and thats what they came up with so I'm really stoked, didn't really expect it to this extent. I'll be running lexan side and rear windows but you can't run a lexan front windscreen. I'll just have to get the windscreen laminated.