Ok so In between working ugly shifts and hours this week I've started to mock up some plans and talked to some guys out Windsor way about getting stuff bent and that kinda thing.
But as you can see from the photos this part of the skid should be fairly easy, I've added "wings" to the side of it so it should be stiff enough to bridge the gap between crossmembers,
The general consensus to people I have talked to should be that 4mm should be thick enough. On top of that I will add UHMWPE along the edges so if I get hung up on steps it slides a lot more easily.
I've just got to work out the best way for me to mount them to the actual car