You have sketched your ideal guitar shape, it looks good on paper but will it work full size? Berlin guitar blogger GuitarRen has designed some great guitar shapes. GuitarRen tested his designs with cardboard mock ups, painting them and adding aluminium foil. He even added pickups and control knobs. This is a great way to test a design before starting to build. I think the one on the left is best, the long lower horn should give it good balance and ergonomics.