I've done a little of bit experimenting with time lapse on my GoPro. It really depends what you are trying to achieve. The 1 or 2 second setting will produce a smoother playback. Here is a little flying video I did, with a short time lapse, shot at a 2 second interval. About 24 seconds, which shows about 25 min of shooting time. https://vimeo.com/49916641
However, if you are trying to show your complete build as a time lapse, where the car appears to grow from nothing to a finished project, you may need to shoot at maybe a 1 minute interval. If your build were to take 1,000 hours, that is 3.6 million seconds, at a 2 second interval you would end up with about 8 hours of footage, at 60fps playback. At the 1 minute setting, it would be about 16 min.
Another challenge with time lapse sequences, is the editing. If you're trying to edit out your good looks
every time you turn on the camera, at a fast setting, you'll be going through a lot of pictures.
BTW, I'm no expert by a long shot. This is just from my own farting around
I do enjoy your build.