EATX and XLATX motherboards are supported — the largest board I’ve personally had in it is an ASUS Maximus IV Extreme-Z — but I don’t know about EEB. That said, “EATX” isn’t a real spec, so tread with caution.
Yep, and to be fair, you could just use a piece of plywood and make one yourself for next-to-nothing. Lay the mobo on the material. Clamp two edges so it won’t move. Trace the mobo’s outline with a pencil. Drill directly through all the mounting holes you want to use. Remove the mobo. Cut the plywood along the outline. Fix a bunch of timber insert nuts in the drilled holes. Screw in your spacers and mount your mobo. Maybe 20 minutes if you’ve never done anything like it before. Total cost of materials is under $10. Been there, done that.
A long while ago I drilled out some 5mm aluminium checker plate and used it to mount a mobo, PSU, and multiple drives to a wall. Worked fine.
I currently even have a mITX mobo and ATX PSU mounted upside down under a bench, suspended by a loop of fine steel cable.
You can get creative if you want to.
That said, the BC1 does come with these cool standoffs that are flared and slotted on the top, so you just push the mobo into place until it clicks and you’re done. To get the mobo off, you just pull it off. No screws required. Really, really nice if you are messing with or swapping mobos a LOT.
Another option is to strip the glass panels from a Lian Li PC-O11D XL and lay it on its side – instant testbench! Use like this while testing, then when system is tuned, DIY a few high airflow panels instead of all that heavy glass. Lots of space all around the motherboard, and accommodates up to three PSUs “underneath”.
Since my head was spinning I went for the cheapest option that was Amazon prime eligible I could find.
But intrigued by the BC1 and probably would have pulled the trigger if I had found it with fast free shipping.
Maybe it is complete garbage, but this is what I ended up ordering.