Wow leaps and bounds, doing really well, it is amazing how much can be achieved when everything falls in to place. I used the Dave M hand painted decals so I didn't have to find how many stripes where needed, counted 12 on mine, here they are
I have used a tshirt latex paint for my hand guards it does give some flexability, not sure if it would be good enough for the elastic on your boots. Other than that you could try standard spray paint, I have used it on material before and has worked.
You will have fun with the blaster build, you can do some nice mods to them too, just depends how far you want to go, I do like being able to see lights and hear sound, so do the kiddies