Hi David,
I think it would be an idea to combine forces. CSS is my weak point, so
if you are up for themeing pier. The CSS you have done can be combined
with Pier-Jetsam-Environment fairly easily.
As for getting it working, I am using it at present so it definitely
works, you probably missed the correct prerequisite packages. You will
need the Seaside28Jetsam package from
www.squeaksource.com/Jetsam (you
may also need Kernel-Extensions from
squeaksource.com/311)
You might be interested to see my WACss class for assembling css using a
class. I have also integrated NiftyCorners.
best regards
Keith