I am finally ordering all of my herculien parts and I can not find the circular gt2 belts and I am a bit confused with the ordering of the metal for the bed and I can not find the stls for the drill templates. I hope someone can help and I am excited to finally start.
On the Git you will find all the dxf, pdf etc for all the drawings … pls look here
https://github.com/eclsnowman/HercuLien/tree/master/Drawings
also close loop belts check at http://www.robotdigg.com/
closed loop belt
http://www.sdp-si.com/eStore/Catalog/PartNumber/A%206R51M113060
hope this help 
Good luck
Misumi also has the belts but robot digg has the best deals
Robotdigg belts are best.