Marc,
No, I didn't keep a build log of the TIE...it was actually one of those "build in an afternoon" type things. It was on sale at Hobby Lobby and I picked it up for under $10 IIRC...so I had fun with it while on a Christmas vacation break. Sold it to a coworker for $40 because he was a huge Star Wars fan.
As for the four corners spot, it turns out that with the modern GPS surveying gear that the spot currently marked with the monument and bronze plate that everyone likes to have their photo on showing they were in "4 states at the same time" is not actually at the right place. The survey done in the late 19th century used the technology available at the time and was only recently proven to not be as precise as previously thought.