Your Capra Thing looks good. Two quick questions... How is that Trans holding up? I've been thinking of getting one of those for a scx10.2 project I have and need a reverse trans for it. Second is, how are you linking those tires? I've been thinking of putting 2.2's on my Capra but options on that size seem limited at the moment.
I've only run the car once since the trans swap, but it was trouble free. I got several comments on how quiet the car was at the event. I did open the trans Ave reverse box to grease it before running. I'm pretty sure the squeaking I mentioned in my last post was the driveshaft rubbing on a link screw so I've shifted some stuff to stop that contact.
For the tires, they have worked really well for me. I run them on my bomber as well. The diameter helps somewhat make up for the lack of portals for clearance. I don't think the large diameter makes sense unless you stretch the wheelbase a good bit. Mine's at 14" wb and it does pretty good.