An empty
GW paint pot (the old school style is big enough, the new range I dont think so.
The body is typically a good comparison to the size of a kinder surprise once you add a little plating over it. So it makes a very good internal structure, as anything added will be great. Although saying that a KillaKan can be anything really:
Ah damn,
the second image wouldn't load for some reason. But yeh the base is typically the larger rounded one, not the termie base used here. Have a google and you'll find many