The front uprights are about 3" x 1.5" RHS that has the top capped. The upper shock mounts attach to these. They are made from 3mm plate that's boxed. You can see a bit better in this pic
Front end
The big cross brace in the middle keeps everything rigid and is a bit of a homage to the original Coil spring Cobra front end. The torsion and beaming results are pretty awesome for a ladder frame chassis. In excess of 14,000NM per degree going by the engineers report that came with it.
As you can probably tell I'm impressed with this Cobra kit.
Cheers