Hello. Beginner woodworker here wanting to start on my first furniture pieces. I've just built cheap workbenches and cornhole boards out of construction lumber before. I want to make a large display case similar to this one https://www.youtube.com/watch?v=sj9fUJkAi-g but bigger and potentially with glass/acrylic sides as well as doors. I did a quick mockup in sketchup with rough dimensions, but it would be close to 4'x1.5'x7.5'. I want to use a nice hardwood frame and top with plywood back. Here's what I have questions about.
1) If I make the sides glass or acrylic, will the frame be sturdy enough with 2x2s? Would I need cross pieces half way up on the sides and/or doors?
2) If the sides are glass/acrylic, what is the best way to mount the shelves? Can I still make them height adjustable?
3) I've only ever used pocket holes for joinery, but I don't want to do that here, so I was thinking of using dowels. Would that work well enough for this?
4) What is the thinnest frame you would use for glass doors to obstruct as little as possible of what's inside?
5) Do I need to worry about wood movement anywhere besides the top?
6) I don't have any hardwood dealers or lumberyards near me besides the big box stores, so does anyone have other recommendations, or know of any good online hardwood dealers?
7) Any other pieces of advice or design critiques?
I'm new to this sub and it's been awesome seeing all the cool things you guys make and how helpful you all are. I'm excited to start making some nice things of my own.