I made these designs in the hope that someone would have the patience 
and the parts to actually implement them (ok, or even care enough to 
look at them).  I am proud to say that a fellow Lego Junkie from the 
MindStorms Forums saw my designs and has adapted them to use in the 
roller coaster he is *building* in MLCAD.  (On the MindStorms site, 
check the userpage for "ViperGTS")

Contact me at Ender0x@cs.com