You're right. I've manage to do it. I had only one issue: I'm not sure if it depends on the guitar's cavity shapes or the bareknuckles shapes but I had to enlarge the cavities to fit the humbuckers. It's not the usual "customize my new guitar" procedure that I usually follow when switching pups. Honestly I am wondering if I'll have the same kind if issues with other pickups brands and Chapman guitars.
Wider unfortunately, humbuckers don't fit and it's not a here issue of the rounded ears which I trimmed down, the space of the double coils is not big enough.
Honestly the guitar is beautiful and if has all of the specs I am looking for, but considering for the future to purchase another one and having to go through the same process is not very appealing.