How hard would it be to make an rts based on BGE? i.e. Programming, Time, Difficulty

Well all that stuff there basically depends on how in depth you want to make the game. Here is a 14 part tutorial for making a RTS game for blender 2.49 http://www.youtube.com/watch?v=iskfgzBs5eM.

Much appreciated! I am going to fly through some of them to see how hard it is. I am also going to see how hard it is to program Dark Basic Pro.