That looks to be quite an ambitious project, but one well within the O-L scope !
The XM-L2 sounds like a great choice, as the higher Vf will likely better suit the over 5V when those NiMh are fully charged. You should be able to maintain regulation until the cells are depleted.
Speaking of the stock driver. Is this one the "good one" or the "bad one"?
I just assumed it’s okay because it has 3 torriods or whatever they are called. It would be better than nothing if my SR King driver craps out.
This is interesting. Did you get the 4/3A cells at the Shack too?
if i remember correctly, and i dont have or want a king so i may be wrong… the three toroid driver is the one you want
very nice! subscribed - interested to see where this goes!
as soon as i regain my mojo after my last several mod failures i am going to add some resistors to my srk
Three P60 reflectors will fit in a Mag D cell head with a little trimming (ok, a lot of trimming, lol), and the King is the same 52mm head AND is deeper than the Mag, so they only need trimming on the sides where they intersect and don't need to be shortened at all (other than chopping off the threads at the bottom)...
Does anyone in the states offer this service? Is it a huge increase in output?
I'm watching with interest. Are you going to detail the driver mod again for the people as unfortunate as myself who did not understand it the first time you did this and whats the actual size of the batteries? I love the comedian OL. Quote, ''It's so ugly I had to slap it when it looked at me'' unquote. Not quiet sure what your referring to here but for some reason I'm still laughing. Thinking about it should I be worried? Cheers.
I think it is seen by the outer edge of each individual led reflector in the 3rd pic after the video.
All-battery (Tenergy). The only manufacturers I know of. Sanyo used to, but I think they don’t now.
EDIT: 4/3AF Nimh Sorry about that. I always leave the F out.
I guess I will detail the driver mod again. Possibly I can try translating it into Aussie when it’s done.
At least this time there is more room (bigger ID of the head), for putting the three drivers in the head. That should make it easier to install.
That’s the first thing that cam to mind. Also 3 TIR optics, but I just don’t know yet. Time will tell.
Hey O-L, did you have any trouble getting the tailcap off? Any glue, loctite etc. on the threads?
None at all. Came right off. Nothing on the threads.
Being that you're swapping emitters you get a lot more flexibility to set the spacing the way you want, much easier than dealing with 3 on a single PCB. Cutting the p60 reflectors it might be less fiddly to spread them out so that the only cut you have to make is at the outside edge so each reflector only needs one cut. The one I'm working on is with a 3-up board, and the reflectors are gonna have to be cut to match the cut on their two neighbors... 
Well crap... mine has thwarted everything I've thrown at it. Strap wrench, heat, you name it. Another user mentioned theirs had red loctite, there must be two different batches of these things.
Crickey fosters. You call that a knife, this is a knife…
Sorry, couldn’t help the aussy S)
Don’t hate me dnf 
This seems like a complicated project !!! .good luck old Lumens 
Thanks. I think you know that I have an idea floating around in my head and it may involve this driver if I can nut it out. Thanks for the offer of translating it but its just me. I understand the principle but making that principle work, well, we'll leave it there. Cheers.