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I have used a website called 80/20 for aluminum slots and it has worked great. I used them to make a lightstand for an earlier tank, but in school we use those to make stands that hold up heavy machinery. Not exactly cheap, but it will be cheaper than custom ordering one. If you do this, draw out your plan and make sure you have the correct measurements (check many times, this shippment can take a few weeks to get there).
If building it from scratch is your plan, I would check out T-Nutz, pretty much everything they have is 80/20 compatible and comparable, for significantly less other sources I've found. https://www.tnutz.comI want to build it myself to save money most places want a grand or more