Here's an easy circular floor from a sphere:
make object sphere 1,10,50,50
scale object 1,100,0,100
You can change those 50's to increase or decrease the detail.
The amount of faces will probably make this difficult to texture, though.
A cone can be used for a much simpler version:
make object cone 1,10
scale object 1,100,0,100
You could also just use a square floor and hide the corners with the walls of your ship (a cylinder shape, I presume?)
I'll whip you one up in Blender if these don't work.
I have nothing better to do. LoL

666GO†O666
