I can only count 21 frets in all the pictures of the neck. A 27" neck will put the bridge back about 12.4mm from the 21st fret compared to a 25.5" scale neck. So not too far. I'd been too influenced i my thinking by Stansby40's ZJ-6 build, which has a 30" scale 21-fret neck on what is basically a standard scale body, so the bridge on that is moved back by 34mm from the 21st fret compared to a 25.5" scale neck, and he's had enough room to fit a full-sized humbucker in the gap.