Combat Action is a very complete universal wargames system by Fabio Fontana. He writes:
Combat Action is a strategy game of small scale conflicts. It can be used to represent skirmishes with a dozen models per side up to larger conflicts with multiple squads, vehicles and support weapons. The system presented within this book comprises two levels of detail, a simple system for small scale games where each model on the battlefield is a separate unit, and a more complex layer which adds optional rules to govern targeting, simulate chain of command and allow larger engagement of forces.
The point system will allow you to design any creature, vehicle or model you like, and field any model you create on the battlefield.
The site also has playscreens, scenarios and a complete world background.