I have an original GTD build manual from GT Developments on EBay if anyone is interested.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6759&item=2463954728
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6759&item=2463954728