I do not really understand what a mobius model should look like... but you can make everything you make downloadable as long as you do not include copyrighted material. To answer your second question, well yes and no. The scanline renderer which is used by poser cannot do reflections, so a realistic chrome which mirrors a lot is not possible in poser. What you can do is work with reflection maps, which simulate this effect, or you export your poser work into a different software, which is able to do raytracing. You do not even have to spend much money on it, there is a free converter to the free raytracer PovRay. Just ask further, we try to be helpfull here....

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.