hey, use rcg for making rollercoasters https://mtasa-resources-rcg.googlecode.com/files/mtasa-resources-rcg-r8.zip place the downloaded folders in the same directory where your map is located (MTA San Andreas 1.3/server/mods/deathmatch/resources) besweet has a nice video on how to use it: http://www.youtube.com/watch?v=aHEb1SGvIlQ