They are weight relieved not chambered. I have a JBLP aged number #28 and it is my favorite, number one, go to guitar. I just love it. I also have one of the WildWood Bonabursts and I love that one too. The neck is much beefier on the Bonaburst. A lot more "meat" to the neck. Sounds fantastic.
From what I've read they made 300 total from the custom shop. 200 +_ 50 Aged Goldtops. then they did some without the relicking and they also did a very few (5) blue ones. Totaling 300 guitars. So the rarest and most difficult to find is the blue one, followed by a non aged gold top then an aged gold top.
I saw a Wildwood bonaburst for sale on "The Gear Page". I think he wanted something like 3300. I would highly recommend calling Wildwood and see what they can do for you. The first guitar I ever bought unseen was through them and they really take the time and give you every chance to get the right one. Not to mention Joe has thrown an impressive amount of swag in the case.
In terms of playing out (i don't) I would probably play my Bonaburst out before the gold top only because the gold top is obviously a Joe guitar. It would be like playing out with a red and white striped guitar ala EVH.
If you keep your eyes on Ebay one occasionally comes up for sale there too. Good hunting. We have a fantastic part of the forum where Joe explains his live rig, guitars, etc.....with links to youtube videos that are full of info. Plus once in a while Joe pops in here and offers advise or just says hi.