80/20 or similar to build small/removable cargo shelf ?

the connectors came in today. I test fit and it seems to be more of a snug fit than loose, but I think that may be a good thing. It took some whapping with a mallet to get them in, and the same to get them out. Hopefully i get started with the cutting and building this weekend.

I have read you can use a decent power miter saw without a special blade for aluminum. Anyone try that or have an idea? Not looking to use my sawzall or buy blades if I can avoid it.
 

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