I decided to modify an existing Map, one created by Russel Fleming called MARAKART which was a favourite of mine.
He based this level on Super Mario Kart for the Nintendo NES system. "Its a great game. It has tons of maps to race competitively on but it also has 4 maps for designed for carnage, not racing... I stole ("borrowed') the floorplan from one of the carnage levels. I thought it would be a good map because it is a simple but fun design." <rfleming@gpu.srv.ualberta.ca>
I've added aliens to battle (sorely missed from his version) and added a platform on which to climb onto several ridges, invisibility and invincibility a couple hiding places...