Just finished assembling my hot rod and am leak testing it now. Assembly is relatively easy and the product is really brilliant in its simplicity.
No home improvement stores around me had the recommended power cable available by the foot, so I had to buy a 25' spool. Also, the standard SJOOW cable was only rated for up to 100C. While that probably would have been okay, I didn't want to risk it and bought a slightly more pricey product rated up to 105C. The drawback is that now I have about 10-12' of cable that I'll probably never use.
If anyone is building one and would like to avoid having to go out and find cable, send me a message. If you pay for a shipping label, I'll send you the remainder of my 12-3 SJEOOW cable so long as you promise to put it to good use.