The dimensions in studs for each shoe of the excavator is 46 studs long by 8.3(maybe 8 or 9) studs wide by 10.5 studs tall. That means the total shoe structure should be 45 studs long and 10 studs tall with the track making up the remaining space above, below, front, and back.
From the discussion on the Eurobricks forum, there is interest in what sprockets will be used. I have not been able to find dimensions on the diameter of the main drive and idler sprockets at the front and back of the tracks. From various diagrams and photos I'm guessing these to be about 8 studs. The stock sprockets are roughly 3 and 5 studs in diameter; clearly too small. I'm currently considering the wheel from the old mining vehicle for its ability to be used as a planetary gear set and the large turntable for its almost 8 stud size. Probably something like this:
The only problem here is that while the teeth on the type 3 large turntable work on the track because of the larger spacing between teeth(vs type 2 pictured which doesn't), it doesn't drive the track acceptably well when I try it in practice. Probably the driven turntable will in turn drive some other gear mechanism going to a small 3 stud sprocket to drive the track at the same rate. At least that is what I'm hoping since I like the size of the large turntable.
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