This has changed from now, I have created a prison, it replaces the big stadium.
The only less nice point is that in transparent mode the construction place is shown, I don't know yet how to solve this. However i never play in this mode.
The prison is only available in DOS format.
EDIT I did some experiment, and here is "i hope" a good WINDOWS verion of the prison, can some one try this one out and tell me if it worked

EDIT 2 I have removed the .exe_WIN because it doesnt work.
EDIT 3 I now have a .exe for WIN that works, it has no undo file.