thats a huge paddle headstock PK. What you need to find out of the treble side of the HS needs to be thicker to side mount the tuners, or if the whole HS is say about 16-18mm thick whether the bass side needs longer tuners for the extra width. Is it possible to glue a wedge shape so the treble side is thicker for the side mount tuners ? Find out how wide a Kluson type tuner is.
If Billy Gibbons plays this axe it's ultra cool