Definitely doable. I have a fairly simple design in my head for this involving triple-plyed 2x4 beams and posts, interlocked at the top shelf joints to form a very solid and stiff top shelf. Simple enough i sketched it up fairly quickly at work. Apologies if its a little off scale, i have no fancy grid paper or computer program in hand to make it look official.
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All dimensional 2x4 lumber, thing would be around 84"x19"x40-42" overall depending on the clearance on bottom shelf. The trick would be to construct the inside "frame" of the top shelf first and then build the stand from the inside out essentially.
Alternatively you could use thicker lumber for the beams, but i was just using 2x4 to keep costs low and clearance on the lower shelf as much as possible. A piece of 3/4" plywood mounted to the top would add significant strength to the top shelf as well.
You would need a few boxes of 3", 4.5", and 6" deck screws and it would not hurt to wood glue the beams and posts together as well.
Apologies if this isnt what you were looking for. Sounds like a fun project keep us posted when you get it goin.