I think that's Merle's sdkfz 251 conversion running on an older el-mod setup...
Here's a short vid of Phil's M16 tank destroyer conversion being chased across the Danville battlefield by my M3A1 conversion
http://www.youtube.com/user/ExPatTan.../2/PR7EDvX8nqs
I like them so much I bought 2:
I just put the El-Mod M16 electronics and battle circuit in yesterday - the wiring looks a bit unsightly, but it works and I can traverse the turret around most of the way before I run out of ribbon cable. The El-Mod board is a straight drop in, I used a small Spektrum receiver that fits inside one of the fuel tanks, and the CSI board is crammed into the gunners seat in the turret. took about an hour in all to fit.
The M3A1 has a lower floor, so I couldn't fit the El-Mod in it. At the moment is runs on a Scorpion Mini robot ESC that fits under the troop bench - very small but it does whine badly (that the whine you can hear in the video). I have a set of Clark model electronics you can just see stuffed behind the seat, I'm hoping to get that working when I have time as this will add sounds and a battle circuit.