re: reflectors, not to advertise for DX but:
http://www.dealextreme.com/details.dx/sku.2394 (LED)
http://www.dealextreme.com/details.dx/sku.3257
http://www.dealextreme.com/details.dx/sku.5955
I've used the smooth reflector. It will fit inside the Gladius head. In a nutshell, I ground off the threaded portion of the base until it was flush with the bottom of LED hole. Then I made insulating spacers by cutting donut shaped shims out of spare photo printer paper (you can draw a circle around the outer edge of the reflector base onto the photo paper for outside diameter).
After straight swapping out the old luxeon or seoul with the Q5, add two layers of the shim (to start) between the LED star and the reflector. You will have to remove the original IMS reflector and metal reflector holder (won't be using them). Don't forget the little BB during reassembly. When everything is snug, you will have an approximate 1mm gap between bezel and body. If you want to get rid of that gap, you will probably need to grind about the same thickness off the front of the reflector.
I haven't done that yet because I wasn't sure if the reflector finish would chip/flake or not (I don't have a grinder so I hand "grind" the threads off on my front door step cement - yuck, I know). Play with number of shims to adjust focus. Beam will not be as tight as MRV, Tiablo, DBS, etal but hotspot will be more defined than Seoul/IMS combo and will be brighter with more throw (IMO). As soon as my next set of parts comes, I will try to put some pictures together...
NOTE (!!) - work in progress - I have not done any water resistance testing or run time testing or reliability/long term testing! Do the mod at your own risk (think warranty)...