I remember that buggy, but I never really looked into it deeply.
If you refer to these pictures he posted:
http://img232.imageshack.us/my.php?image=img003se6.jpg
http://img136.imageshack.us/my.php?image=img002bh6.jpg
You can infer that he is using PowerGrip GT belts, with a 3mm pitch and 9mm width. Well, that belt type is the EXACT same one I am using for my truggy belt drive conversion!
This guy definitely has CAD skills, but some parts of his design are far from ideal IMO (such as relying on screws to act as bushings in his steering system). The features he has put into it are awesome though! And his choice of material (aluminum) will cause the buggy to be quite heavy I think.
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz