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I could provide a detail on how to join them, but I would need to submit a premium service offer to do that.
As the vertical posts?
What is the city and state so I can look at snow loading?
You can plan for W8x28 beams ASTM A992 Gr. 50
I would not recommend mixing aluminum and steel unless you provide a dielectric break. Otherwise you will promote galvanic corrosion by having dissimilar metals in contact with each other. There are ways around this, but you would need a very specific detail to isolate the metals from touching each other.
As steel, they could be W4x13 beams
12x7x14.292 for the main beams (6061-T6)
7x4.5x5.8 for the purlins spaced at 3' on center. Both will require bracing against lateral torsional buckling along their length.
Hello. Do you have any other questions for me on this topic? If you could rate my answer, I would appreciate it.