I have a strange take on this. I like to desing my own. I often used photos that I find on-line as inspiraton and then draw my own design, but have never purchased any plans. Now, I am wanting to build a Pechovich inspired wall cabinet but found that my final design is so much like his (he has such a great sense of design) that I feel like I have cheated somehow. Maybe I wil put his intials on the bottom along with my signature.???
My version of this "problem" is that I over design (draw it up in great detail) at times. I envy those who can have a picture in their head along with a couple of overall dimensions and go right to the shop and "work it out" as they go along. I tend to draw everything in detail before I go into the shop. Yeah, I will sometimes find and solve a problem on paper rather that making a mistake in the shop but it feels like I am wasting time rather than wood working.
Matt did it for looks, but he seemed to assume you needed to put the piano hinge on the outside. I agree, one of my concerns is that I'll do all these hinges and then have it bind in operation. There's a nice looking 24" piano hinge that I'm considering (x4, obviously). It's probably the next cheapest option, if I'm not using my eBay hinges.