Any idea how much these would cost and XL ATX, will that also be SSI EEB?
Haven't gotten as far as cost yet. as for SSI EEB i believe they are:
12 x 13 inches ( 305 x 330mm )
where as XL-ATX is
12 x 9.6 inches ( 305 x 244mm)
There is definitely enough room in the case to support the SSI EEB standard but the following parts would need a rework on my part.
Motherboard Tray ( including updates to hole locations for board mount points ) ( Two units )
Motherboard Tray Backplate ( 2 units )
Motherboard left and right slide rails ( 4 units )
Case divider panel. ( 2 units )
Also this might decrease the amount of water cooling space available by one unit as the tray that acts as a mount point for an internal rad would be compromised by the extra motherboard length.
For reference what I have done above - was done in 15 days learning CAD from scratch - on a trial version of the product, it all would depend on how long it would take to alter the above parts over and above the base price ( which of course I don't have yet ) in order to know if it was a viable option.
Once I have one XL-ATX tray validated ( which verifies my design against the ATX spec ) I will have a better idea of what the build cost will be - getting that part done is basically the acid test for if the whole thing will work.
If this works out I may instead of getting units built sell the plans so you can go to any local metal work shop and get it built this of course will save a huge amount in shipping costs because even though this is a 1.6mm Thick aluminum build I still expect it will weigh in excess of 30lbs and even though it can be flat packed no problems it would be very costly to ship.
As with anything though if anyone throws enough money at it - it will happen - let me get the first unit sorted ( mine ) and we will build on it from there, I may even produce a version that can take 3 boards 1 Left, 1 Right, 1 Upper, Watercooling if wanted and still have Rackmount space in the case.
Let me know if you are still interested and I'll keep you updated as things progress.