I fully agree for asking permission to the authors, but I have some second thoughts about what 's been said during the previous posts
1. Permission required when you want to edit a shape/texture
Add the original authors credits in the gp4form.txt
2. Add the authors credits to the gp4form.txt if you want a car to be
published in a cars.wad to the community.
I don't see why you should have to ask 'permission' if you 're not
going to modify a shape/texture. The whole idea about publishing
it was that everyone can use the new car.
"Designed by the community for the community" ...........or not??
This is only my personal opinion.
However, if the designer insist on asking permission, I'll ask !!!!