Thanks a lot for your help and guidance. Would take me ages to find all this data.

Ok, so far I have 3 or more schematics in form of .skp, .pdf or .jpeg for ATX f.f. Will check them all for measures to be sure. HPTX data seems to be fine too and Brodholm also confirmed on this, so prolly won't check drawings for this.

Yet, critical data we have here is concerning the E-ATX and XL-ATX.

For E-ATX asura left the link which if you read the thread will take you to this http://downloadmirror.intel.com/1812...chProdSpec.pdf - page 55, basically the only data with measurements I've found for this form factor. What worries me is that Intel's mobo has measures of 13x12" while I see that eVGA's have 12x10,375"... Don't like that? Also, there is EVGA Tri-SLI Classified sketch here http://scc.jezmckean.com/cat/19, for which I dunno should I rely on... So, either Intel or eVGA isn't following the standard? Dunno... But looking on some simple diagram, http://www.evga.com/articles/00501/, I get the feeling E-ATX is using only 2 additional holes on far right? And the rest are remnants from ATX, it's just a bit wider? Can anyone confirm this please?

Regarding XL-ATX, thanks to Wolf132 we got one schematic, though I have nothing to compare it except this sketchup http://www.evga.com/articles/00501/ of eVGA's X58 Classified 4-Way SLI Edition. Also dunno can I rely on it.

If there's more data on XL-ATX and E-ATX please post it. Once I get enough for comparing I will try to draw a universal MB tray, never used Sketchup or any tool of similar kind (student of medicine, nothing here but enthusiasm ) so prolly will do it by hand and leave it for future builders ...

Thanks once more.