Here you can find the information I used. http://radek-rudnicki.net/elektron-rack/
Only thing I miss here, is that the cooling-area on the side of the machines is not open in this design (as far as I can see). I carved this out of the wood, but you cannot see this on the picture. Tomorrow I will make them even more open.
Watch out with the screws. They are M3, and only go into my machine for 2 mm. Some people screwed up their machines with too big screws.
My connection between the 2 pieces of the wood is with a Hinge. I think Radek has a different connection. He can easilly disconnect his parts. I think this is better... I couldn't find a good solution for it but I am still busy with it.
The wood I used is Meranti, it is really good wood and I found it in my old child bed. So zero cost.
I must admit, my father has a wood workplace, so I had all to tools in reach. Some woodworkers here lasercut it for you, if you want to.