Once I have Battledress sorted, just about any British loadout is possible. Commando's, Airbourne, regular infantry, SAS are all just minor variations of hat/helmet. With Khaki drill you can then do Desert or early far east and with Jungle greens you can do late war far east.
Another possibility would be to do a steampunk loadout and add a red dot sight held on with brass strips, build a wooden stock around the current metal one etc.
It's the performance of the gun that amazes me though. It is ridiculously accurate and has a very high rate of fire, I just recieved a 9.6V NiMH stick battery and tested it and it is truly terrifying. You just get a line of bb's from the end of the barrel to the target with very little separation, if you hit someone once, you're going to hit them with a lot of bb's in a very small area and that will hurt.
Watch this test of the shoot and scoot MP-18, its the ASG Sten with a wooden stock and different heat shield added, they got all shots within a 5cm radius at 30meters with .3 bbs