I could build a tank that size but I prefer to not do those size tanks. If you really want to build a tank like that I could offer you advice tell you what materials to buy and what type of glue to use. I wouldn't personally build it just for the liability reasons. I would build it for myself but that's because it if it fell apart at least it's in my house and not yours. Just so you know i have almost 20 years experience working with plastics and building tanks,sumps,reactors,and skimmers.