Thanks for showing,makes it easier to see what's going on.
The whole angle based smoothing approach is tricky indeed.
Took me some time until I realized that you can have different
angles for different parts of one model for example.And then again
not every app accepts more than one angle,it seems.(Don't know
if TG does.)
If you look at some free LW models you'll find lots of unwelded parts,
don't know,if that's done on purpose,but it's a way of getting creases
where you want them without having to rely on that angle based smoothing.
Those are some reasons why I like the simplified hard edge approach
of Wings better.
Another way is beveling,but that really increases the polycount and can
be hard to execute occasionally.
The vultures are a nice addition btw.
.