After reading all the issues people have had with TanTan (Seraph) frames, I have been looking for a frame to build up in case the FM10 I ordered isn't usable for one reason or another.
I found the Winowsports FS839 has geometry numbers very close to, but not exactly the same as, the TanTan FM10:
http://www.winowsports.com/product/M10-enduro-mtb-full-suspension-mtb-frame-travel-135mm-and-150mm-adjustable.htmlIn particular the FS839 has a shorter wheelbase and front center, but a higher stack.
I don't see many Winowsports builds here, can anyone comment on their quality?