Here is a link to the Matchstick museum for you that don't know about it or want to get more information.
http://www.matchstickmarvels.com/index.php/the-models/the-world-trade-centerIt is like 98 to 100 miles from DSM, depending on the way ya go.
There is a direct route that would knock off about 20 miles, but it is pretty much all 4 lane. Personally, I like 2 laners for these kind of rides. If I'm in a hurry to get somewhere, I run Super Slab.
PS: I heard a rumor that Garvis Honda has sold out to Van Wall out of Perry. He owns the Victory, and I think it is Kawasawki dealership in Indianola. Right on the corner of Hwy 92 and Hwy 65.