http://www.guitarscientist.com/electric-guitar-leg-rest/ I recently spent some time searching for something to attach to a mainstream guitar to improve ergonomics while sitting, didn't find much except a narrow 'NeckUp' derived from the acoustic guitar suction-cup version. Seemed to me something that clamps firmly onto thte body is ideal for electric guitar, a suction-cup attachment is of course better for a hollow acoustic guitar that you wouldn't want to clamp. I just found the 'Performaxe' which is a dedicated design being prototyped. Recently i am noticing the bad posture of players using a superstrat in classical position, you see it everywhere on the internet, i cannot unsee it now: Right leg down and to the right to get it out of the way of the convex rounded body (the worst possible shape for resting on the leg). Upper torso twisted to the left because the guitar is so far to the left. Neck twisted further to the left to look at the fretboard. It is obvious that players love to play sitting down, and most metal / ERG players play in classical position. However the superstrat design is a hopelessly bad design for this. No surprise, almost all mainstream guitars have designs taken from the 50s, 60s or 70s (and unfortunately NOT the 80s, as in Steinberger / headless, because that is not retro-fashionable) with little consideration of ergonomics or balance while playing sitting or standing. Ironically it was the 80s that was a brief period of hope and progression that then disappeared in the 90s as retro rock became fashionable again. Since then, 30 years ago, guitar design has regressed in some ways. To fix this posture the upper torso needs to rotate to centre and the right leg needs to be level with the other leg, the guitar body needs to be reshaped and cut around the player's body, with a super long lower horn resting on the left leg.