Thank's all.
Please bear in mind that I'm lazy. I had these lying around since, what? the early nineties or something? Cutting of the heads, replacing them with another head and glueing on a jerrycan was one evening's work. After more than 15 years, rather satisfying, haha.
I had no intend whatsoever to make them look like plausible WW2 technology, just thought it would look cool.