I would make zero mods and find something else to sit on, seriously. I'm not trying to be harsh about it, but the cost and effort are not worth it. Plus, won't you be blocking some of the sound from the speaker?!
Ernie Ball Musicman, Fender, Orange, Aguilar, Genz Benz, TC Electronics, Tech 21, T-Rex, OBBM Cables, Auralex, EB/DR/TI Strings, Herc Stands, JD Picks.