Tank with insulation.
Cut the insulation flush with the top. I also made up and printed a label and a some safety warnings, laminated them in 2 layers of contact paper and stapled them up.
Fitting the liner. I used a 15'x15', 45 mil EPDM sheet. Took some finagling to get it mostly fitted.
So that's where I currently am in the project. I have to tackle the lid next and then probably the pex heat exchanger and all the necessary plumbing.