A Doom Port that keeps score, suggestions?

I was thinking about making a Doom source port that kept score with the help of some fancy graphics.

The main Idea is that each monster type is worth a number of points, not to exciting, but WAIT there’s more!

Each time you kill the same monster type with out picking up an item or killing another monster type an icon of that monster will appear at the top of the screen.
The value of that monster type will multiply by it self, so if you wish to get a high score then your going seek out the same type of monster rather than just blast what ever gets in your way.
items are worth nothing

If you have any suggestions, like what value of each monster type should be, please respond

doom4win

oh ok
well that's makes it easer on me since I not a programmer