That's quite ingenious, IMO. There's no room on the top in vintage location, which with a straight jack always looks like an afterthought, and a throwback on a modern instrument. The pots would clash with internal realestate with a side jack. Though not the norm, I've seen that jack location on more progressive builds. Like Line6man, I think the angle should be facing the the strap button. Location isn't really a hinderance.