That's really strange... are you sure they are .z2f files?
Btw: you better ask here: http://thezt2roundtable.com/index/
to all of your questions I must answer 'No'. The gift shop pack is just decorational. The toilets do not replace the originals, but they do work as toilets.
It doesn't work like that. It's a hack that makes the zoo wall invisible. And then I"ll place a new fence next to it, which appears to be the zoo wall.
It won't. It's like 8 years old and I will not release part 4.
They should be able to walk over them.
Sorry for that. I fixed them now.
I'm sorry, I don't know why it doesn't work.
That's really strange. Unfortunately, I have no idea why that happens. Try asking at http://thezt2roundtable.com/index/
Glad you like them!