Went all "Franken-Jupiter" with my 6 module November. Running at 1.47 TH/S at 1400W. You can also see my Bitfury gear. 2 rigs run at 760 GH/S and use 750W. Have 5 S1's and 2 Dragons that are housed in my office.
You know that's a painted metal rack that you have naked pcb's resting on, each with a heavy vibrating fan pushing down on them...
I'd get something under those units asap before a through hole solder joint finds something it likes under that paint.
The rack is powder coated. The modules are not that heavy at all, but I see your point.