Man, your drawings are a lot nicer than mine. Rembrandt I ain't for sure. You do a good job on 'em. I've always wanted the Kreg pocket joint tool but never got around to getting one. I used to make a lot of furniture back in the 90's, stuff like Queen Anne tables, etc., but I was going to school at night while working shiftwork and running my landscape company at the same time so the furniture making took a back seat. I've been itching to get back into it again and as soon as I'm done my 3rd (and last I hope) coop and run I'm planning to start doing it again. I love cabriole legs and the fine lines of Queen Anne (furniture, not the actual Queen). You just can't buy stuff like that made from pure walnut. The stuff in the stores is so cheesy it ain't funny. Hand crafted furniture costs a lot to make but it'll last several lifetimes, and that's no exaggeration. I feel like the same goes for stuff like sheds - you're definitely right on the money about that. The stuff in the store is no value whatsoever. Gosh, Tuff Sheds wanted over 7 grand to build me a 12X20 shed when I first moved to my current property. I can build one a lot better for about $3k. You're right about the labor savings. I figured their shed would be more expensive than making it myself of course but I didn't think it'd be that much more. I guess you have to figure it'll be at least double the cost of the material.
I'm getting off topic again but I wanted to say that I switched to using those screws used to attach the mesh they install when building the stucco houses for attaching hardware cloth. Those particular screws have a wide head about the size of a 3/8" washer so you might want take a look at 'em - it might save you from having to buy screws and washers. I've been using them to attach hardware cloth and they work really good. They're in the hardware aisle at Homeless Depot.