Previously i bought a wooden rack from furniture shop to make open bench as well but later found the following issues :
1)not so enviromental friendly - will kill insects and small animals....(OS went BSOD once bcoz remnants of cicak shit stucked to one of the mainboard trace, luckily board was ok)
2)not optimised for cooling unless you have extra fans blowing directly at the gpu/rams
3)NOT INFANT/TODDLER/THOUSAND FINGER KIDS friendly - nuff said.

So i ended up stuffin them back into my Centurion case...most problem solved.