Kudos for a good use of SketchUp. The ukulele is a nice touch.
Just few comments:
Overall it looks really good! It’s maybe a bit overbuilt, but not excessively so. You’ve obviously thought through your storage needs, so I won’t try to second-guess you on the configuration.
However, as @Carlaisle pointed out, this design will involve a fair amount of carpentry. The good news is that it consists of all straight cuts, and you can make them using a circular saw, and with a straightedge for the sheet goods. A miter saw or radial arm saw would, of course, make it even easier.
At the risk of stating the obvious, please use ear and eye protection when you’re building it.
I’m assuming you plan on using screws and not nails for assembly. Although nails are cheaper and have more shear strength, they don’t resist tension like screws do. Nails want to pull out over time, particularly in something like this unit where the loads are changing as you use it. The other advantage screws have over nails is that making the unit modular is far easier. Maybe more importantly, when you discover, after using the unit for a while, that your configuration could be improved by a few changes (like shelf height), screws are your friend. You can change it without having to tear up wood.
My preference, for safety and convenience, is to use higher shelves for lighter objects. The top shelf in your design has the same amount of bracing as the lower shelves. You probably do with fewer 2 x 4 cross braces. Maybe use a single cross brace in the two left side bays and two on the span over the workbench. You could probably also delete the upright on the upper shelf on the right.
Speaking of the workbench, the last one I built used two sheets of ¾” medium density fiberboard (MDF) laminated together. Overkill, perhaps, but it makes for a nice, solid work surface that will accommodate most anything that you could put on it, or do to it, including a decent-sized vise. The laminate covering would definitely be something I’d consider. An alternative would be some galvanized sheet metal.
Not sure how you’d accomplish it, but having clear space under the workbench is nice if you want to sit down while you work at the bench. A rolling stool (I prefer a drafting stool) is a handy thing to have.
Again, it looks like a good approach. Nice work!
