Thanks for quick replies.
@ Dr_Swizz

Yeah, I wanna make one. The ATX is not a problem, I figured that at the worst case scenario I will use the MB as a template for the spacing of holes. As you suggested. But I wanna make it compatible with E-ATX, XL-ATX and preferably HPTX (SR2 is in that form factor e.g.).
So I need to know how big overall MB tray should be, that is changeable regarding what I want besides MB to be placed on it (e.g cable routing holes, place for reservoir...) and most importantly I need spacing for the holes and which holes are shared if any between these form factors. If nothing else, I need some diagram with dimensions of mobos and their holes placing in these form factors and then I will figure out the rest...

@ INFRNL

That would be awesome, especially if those MM trays support all of these form factors. I could copy then the most universal MB tray from your collection, looks like the simplest way so far. I'm not in a hurry, prolly won't start making it for another 3-5 weeks. If you start your work eariler just give me a call please and you will have my eternal gratitude.

Just checked the MM again, looks like the most universal one is this one http://www.mountainmods.com/mountain...tray-p-56.html. The XL-ATX one and HPTX one are made only for those two standards, not supporting smaller ones - E-ATX and ATX, so would be great if you could measure the one from the link, that is hope you have that one. Then I could partially solve the problem. If you have two different mobo trays we could finally make some sort of a drawing combining them. Saw a lot of ppl staying without the solution on this subject.