There's GTRV in Vancouver:
www.gtrv.com. vwteleman just had a really nice van done by them:
viewtopic.php?f=10&t=4554&hilit=gtrv
And dsw4x4 on this forum has
www.coloradocampervan.com - not sure if he'll do pop-tops? His own top is very cool, and I'm sure you've found his thread already
I see more and more people attempting their own tops... maybe with enough people we can get some good step-by-step instructions for the rest.
Cheers,
Mike.