Nope, not a conversion neck - it's a different neck and body. 2 3/8" heel width instead of 2 1/2" and true 3/4" bridge spacing instead of .790"-ish makes everything look and feel correct. Pickups positions are scaled appropriately so everything sounds right, too. I strung the prototype up this morning and it's sweet!
20 fret is vintage, and there's not a lot of cutaway access to reach any more than that... plus the flush heel you get with 20 frets makes the truss rod easy to get to. What do you guys think?