I have setup a a blog about building own kiteboard gear.
Two languages, German and English.
Balsa core and mold injection is the information I provide.
Structural plans and tons of other stuff that might be interesting for you
At the present I have a video HowTo in progress about a strapless kiteboard, Poplar core and mold injected without mold
The url is www.raptorzhome.de.vu
tks
Kosta