A few questions before i go any further...

[Tatey]

The transmission tunnel needs to be modified in order to fit the MT75 gearbox, as the box is wider than the type 9, i think guide is in the book amendments thread in the announcements section.

I THINK you're needing at least 8.8 grade bolts, im not sure what nuts you need though.

Again i THINK the suspension brackets are made out of 3mm plate mild steel.

You fully weld the chassis after tacking all of the suspension brackets in place.

I hope this helps.

[flyerncle]

Nyloc nuts and make sure the bolts are not fully threaded,most are 12mm dia.