I got mine this afternoon and went ahead and put it together.
Here's a link to the unboxing photos on imgur:
This will easily hold 2 cornies. I do not have a 5 Lb. CO2 tank, but I do have a similar size helium tank and I put it in there. I don't see it being a problem to fit 2 cornies + 5 lb. CO2 tank. That's what I am shooting for with this purchase.
I would give the build quality on my unit about a 5 out of 10. It is cooling and I am hopeful to get a few years out of it.