Cracking work, not sure on those seat mounting brackets ![undecided :undecided:](https://www.golfgtiforum.co.uk/Smileys/modern/undecided.gif.pagespeed.ce.pzpJrE4p4e.gif)
Ditto - should be on tubes that run across from sill to tunnel rather than on spindly little uprights that are bolted through the floor.
Obviously, you've fitted reinforcing plates under the floor, right? To ensure the seat won't just tear out, yeah?
At the moment this project looks like it's being completed by someone who's seen a rollcage in a racing car on the telly once, rather than bothered researching what they're doing.
Did you get any specification for the 'mild steel' tubing you're now using to secure your harnesses to, or have you actually just used scaffolding bar?