There are some details of single xml version, it doesn't seem to be very well made, but may be considered as good beginning I think: https://budgetlightforum.com/t/-/5251#comment-105666
I already ordered some liquid to be able to weld aluminium to the driver, this driver pressing oring is not capable of high currents in my opinion, it should be solid welded. We do not know anything on driver, I suppose it may be the same as in 3x xml lamp, hope not, but have to be ready for it, looking now for best 1 cell driver capable of delivering enough power to 3 xml's :)