Hi thar,

I never really understood what the scale of the maps in MM is like, as in, when I start building a map I don't really know how big it will be in the actual game. Is there any way to make out what the ingame size of a map will be whilst making it?

nope dont think there is one..

but when i find a size i like on a map i just open that map and delete the middle polys and go on from there..

I don't see the problem.. maybe play Soldat in windowed mode for a while. The resolution is 640*480 and as far as I know the map maker shows the exact same size.
Maybe that will help.