We're not saying that it is impossible, but personally I don't find it interesting at all to try and make my executables as small as possible by using tools that I wont normally use. To me it seems like an unnecessary requirement for a challenge about drawing an image with obscure code.

I might give this challenge a try, but I wont bother about size limit, and I think many other would be put off as well about the size limit if they can't use the tools they are familiar with.