Thought I'd share a conversion I've been working on this summer for us Tamiya fans out there. It's a 3 gear laydown conversion for the TRF211XM and TRF201XM/XMW. I designed a new gear case and got it printed at Shapeways. The shock mount and battery strap are also bespoke and available from Fibre Lyte. It uses the Yokomo YZ2 CA 43t idler and motor mount, but everything else is Tamiya. Mine's got the TA06 gear diff in it, but you can fit the ball diff with spacers and shims, just like the 211XM and 201XMW.
You need to lop off the rear battery posts on the 211 tub and drill a hole in the lip at the rear to access the bottom motor fixing screw. I did a hole guide on Shapeways as well to get the new holes for the battery stop.
This is my electronics install. Hobbywing Quicrun BL120 ESC and 4000kv Speed Passion 10.5R MMM. I still like 40Mhz radios, hence the size of the Rx
I'm running 26/77 gearing for a 7.7 FDR. I've not raced it, but it's been run plenty at RHR on track days.
The body is a Team Azarashi Fascia for a YZ2 which incorporates the spur gear cover. Ken Reith from Cobra Products has built his onto a custom made aluminium chassis and used a Penguin XB2 body.
The parts list and instructions are over on my Shapeways store, CTE RC
https://www.shapeways.com/shops/cotic-rc
Hope you like it. Cheers!