No problem. It's a reasonable question to ask and it does make you stop and think. Most parts of it are do-able if you've got the mind and ability to do it, and are willing to have a go. But it's the neck width that's really the biggest issue. A Rickenbacker 360/12 has a nut width of 1 5/8", or 41.2mm. You can space the strings out more towards the edge of the fretboard, but it will still be pretty tight on a 42mm nut, with a much smaller distance between string pairs than you get on a 6-string.