Ok here goes.
The chassis, wishbones and hubs and drive shafts are TC3.
The diffs are Schumacher Mi2.
The diff housings are Yokomo YR4 and the motor mount and layshaft mount are for Yokomo YR4 models, made by Fastrax - I think that one is the Type J motor mount, but I have turned it back to front to put the motor ahead of the spur gear.
The 2 layshaft pulleys are modified Losi XXXS items with an RW spur gear sandwiched in between.
The belts were an absolute headache. Rear is a Schumacher CAT and SST slim belt. Front is one of the many Yokomo YR4 variants. There are 3 or 4 lengths to choose from. I think the one I used is also J Type.
I'm now plotting out the steering and going through my boxes of "rubbish" to find suitable bits. It's quite fun.