Usually the easiest way to do these sorts of worlds is as a computer simulation, Do you have any programming experience?

Nasa for example as Ringworld as there example of weird physics world (http://settlement.arc.nasa.gov/teacher/materials/ringworld/ringworld.html)

I have one thats even weirder I have a flat universe spinning via a centre of mass so the universe has centripedal force throughtout ... very funny effects.

I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.