yeah I also used this shelf from target.
http://www.target.com/p/adjustable-3-tier-wide-wire-shelving-chrome-room-essentials/-/A-17136152?lnk=abtest_searchpdp_2it was 32 bucks. and I got 2 sets of it along with the 92 for the silver foam.
so 92 + 32+ 32 = 166 allows 2 shelf sets which can fit a lot of gear.
The silver tunnel moves all air in the right direction It also cuts sound quite a bit.. but in my case it stops rain fall.
I lost an eth rig to hurricane Matthew but I was lucky the atx pus got wet and killed the mobo at the 8 pin plug in.
the four gpus are good
the cpu is good
the m2 ssd is good
the ram is good.
one shelf rack and the better foam in a double thickness
I then did a second tier of water proof with this
http://www.lowes.com/pd/Reflectix-100-sq-ft-Reflective-Roll-Insulation-48-in-W-x-25-ft-L/3011906it is 40 bucks for 25 feet and it cut sound down some what but it really work well to prevent leaks.
Job has room for 2 or 3 eth rigs on second shelf