thanks, time to build a flasher
Thanks Telefox, im a real amateur at robotics and electronics. I have some transistors from an old electrical kit i bought, I’ll see if I can build my own flasher unit with them or buy some stuff If i can’t. 
almost done
here is another work-in-progress image. as you can see, the tank is nearly done, and if I can get the gearbox right (maybe uograde it with some more powerful motors of some electric kit) then the tank will run fully within a couple of weeks.
the white stuff is modelling paste, which i have used to simulate dirt (once painted) and hide some of the glue/cracks. I know the tracks are a but thin, but I am hoping to buy a kit from an M113 APC model from Frontline Hobbies