Question: what can i use to build a model roller coaster in two days? 

Answer: You can buy a roller coaster kit at most hobby stores. The most popular are the ones by Miniature Amusements, Knex, Coaster Dynamix, and Imaginarium. Some of the kits are challenging, but a lot of fun when you finish them. I had the most success with the Knex roller coaster kits - lots of fun! Do a Yahoo search under any of those names to get more information. Good luck and have fun!
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