The tutorial is gonna make me and a lot of others very happy.
So thanks Riccardo for doing this
It's probably best if you start from scratch for 2 reasons.
Firstly for the benefit of people who are not aware of Bob's track builder.
To show them what a great tool it is. And show them how to use it.
And secondly to show if there is any specific format that textures have to be in from the start,
and how to deal with things like merging roads so as there isn't one road surface under another,
and multi-material objects (both of which I believe netKar has problems with), in a format that netKar will accept
and won't cause problems down the line.