As I said there are lots of limitations, but nevertheless you can still alter a lot of things. It's not because you can't change the post links (you can change the delimiter, though) that it won't be worth it to write a template from scratch and write all the HTML and CSS yourself (without editing source files). Ofcourse, you'll need the original template as a reference to see which tags you need.
I once started writing a new template from scratch which doesn't resemble UseBB's in any way. Unfortunately, I didn't got around to complete it (I believe I even don't have the code anymore), but it would have been a fine demonstration of what you can actually do.


