Update:
I went to my local Academy and purchased this outfit. In total it cost me $19! (probably the cheapest thing going into this!) I tried to go as accurate as possible and the main difference is that the arm holes are tighter, whereas in the reference picture, the holes are bigger. I'll fix that later, but it's the least of my worries at the moment.
Here's a WIP rough cardboard skeleton of the tank I am going to make. After I finish the skeleton I will Fiberglass, Bondo, and paint it.
The smoke machine will fit perfectly inside the tank. My only worry is the amount of thickness that the fiberglass will add, which may make the machine not fit.
If fiberglass adds a lot of thickness, how should I go about this? I don't want to remake the skeleton, so what are the alternatives?
I could just use Bondo: glass, which has fiberglass in it, or fiberglass the outside and then Bondo over it.
Do I have any suggestions?