It will totally depend on what you want done by them and whether you provide the base gun or buy directly from them. I've done it both ways and am completely happy with the 3 Cajunized CZs that I have. It also depends on their current work load because there are times when they are not accepting new work.
Best thing to do is decide what you want them to do for you by reviewing their site and send an email so they can respond. You could also call, but I don't do that as it interrupts the work they are doing for others and they are VERY good about responding to emails.
After your work comes up, either David or Scott will contact you and go over the project before they begin and, usually, when done to let you know your gun is going to be returned to you shortly.