Awesoem, cheers JJ I'll have to check out that site! TBH it's still in early days...I like TL photography, but being static can get a bit samey, and there's some amazing stuff out there done on just a short piece of track. My colelagues and I are building our own partly because we're geeks (and unashamed), partly because we don't have $2500 + to shell out on a factory one, and partly because we think we can make a better one than everyone else ;-) lol.
I'll let you know how we get on for sure. Our design will (hopefully) be able to run on unlimited track, made from local bunnings type stuff, so the only limit is the space in the car you have to get to your location. Should also be good for video footage too. Although like I say, it's only theory at the moment...hope it works.