Man, I'm definitely interested in these. Can you post a picture of what these look like? There's only a CAD render of the board on the technobit.eu website.
Can you stack these with standoffs or something? Sorry, haven't used these before but they look pretty sweet.
Here is my ebay listing, description, terms and conditions are all the same.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=171259369320&ssPageName=STRK:MESE:ITYes they stack, but it is a little wonky as they just set atop each other. If you have a bunch I would consider shifting the fans to the front face, like the bit burner configuration.
@Dave
I don't see it, typically mine sell for 120 to 140 plus shipping.
Ebay and Paypal cost around 6-10% if you sell alot, but charge back risk is typically another 10% for me.