well i didnt document the build great. that was one of my first diy projects, wasn't very proud of it. but i did snap this picture when i was done with it.
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stupid old tank, you can clearly see the monumental fractures in the bottom panel that i so brazenly tried to repair.
first i just glued some foam together. it started like so and gradually turned to the different fragments and what not.
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then i covered them in three coats of hydraulic cement, painted/sealed them with plasti-dip, and used 3-4 tubes of silicone to get them to stick to the back.
i wouldnt follow my pattern exactly though, i was just a beginner with this one and am not gonna pretend to be a pro at it. there are a lot of members here with breathtaking setups that will be able to help a lot more.