Tube synth diy

From this post here:
http://matrixsynth.blogspot.com/2008/01/mean-sucker-vcf.html

It looks like it is designed to run off a +12V/+5V supply, which
makes me think that it could easily be adapted to run off +15V.
Apparently, there are PCB's available, but I don't know how to get
one, because I cannot read Dutch.   If anyone can figure it out and
post back to the list, that would be much appreciated.

Thanks :)