Strider is exactly right. The cellulose is quite a bit cheaper than rigid foam, and low cost is the reason why I'm using it. The frame will costvery little and be quite simple.
Directly under the 4x8 sheet of plywood for the tank, I'll be using multiple sheets of rigid foam. I know the first layer will be polyiso to take the heat, after that I'll go with whatever is cheaper which will probably be polystyrene.
The top will be similar to the bottom with at least one piece of rigid foam. I'm not exactly sure how the rest will be. I'm thinking I might make a frame and fill it with cellulose too, but we'll see.
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