I bought 2 48"w by 71"h cabinets with full length doors from Home Depot. They come with a full width top shelf and 2 half width shelves. I bought a melamine (sp?) 19-3/4" wide board and HD cut it into 4 more shelves for me. You have multiple choices for where to place the shelves. I don't have a picture, so I hope you get the idea.
The doors are SO necessary here in AZ to keep out the dust AND sunshine - I have big sliding glass doors at the end of my sewing room. I love the light, so I really need the doors on the cabinets.
My stash is upright, folded on foam core, kinda looks like a fabric store. I buy it at Dollar Tree for $1 per sheet - 20"x30" - and cut them in 4-7'1/2"x20" pieces. That fits with just a little space above it on those top shelves. I would love to use the thinner comic boards, but they aren't tall enough. The shelves are deeper than my wrapped boards, so I put plastic shoe boxes filled with FQs in front of the stash. Each shoe box has just one color of FQs. Right now, everything is neat - because I'm between projects. I should probably take a picture!