Well I like going precise on my builds, only allowing some artistic liberty with straightening some things out. So I'm actually still on the fence about using another kit as a basis, which will probably only have small differences compared to the Tamiya Sherman.
Even though the sizing might be ok (haven't done any measurements on the tracks yet), the details will be way more of that i'd be comfortable with. Also note that the tracks had an addition to them so were wider than the kit parts themselves.
Cheers,
Marvin