Make one! I made one for about 10$ with a trip to Home depot. The motherboard is bolted on the black painted board with .75 inch risers so PSU cables can pass underneath, PSU is velcro'd to the board, psu is on top so all cables would come out of the left side. Don't read what others say about ambient heat making an open air design hot, I got stable mobo temps ~32 idle and cpu temps under 32/42 on idle/load.
It is not as tall is it looks, it's just the angle of the pic.