Tunnel Maker

There is a program for No Limits that you all should know:
Tunnel Maker.
I think this program works really well, but now I want to know a few things about it:
- How can you make the inside color of a tunnel different from the outside color? (I know you can because I saw it in the first tunnel of http://www.weeweeslap.com/track_exchange/detail.asp?tid=3339 this coaster.
- What does the "Double-Sided Faces" option do, and how does it work?

Hope someone can answer this question and take my coasters another step up the ladder [:D]

i think... that we have known about this program since its been relised

it can be found here
http://gravimetricstudios.com/software/ ... /index.cfm

to change the tunel colour, u do so when opening the track file
to change only the inside, it can be changed in a 3d program like 3d max