The main problem isn't that you're trying to get us to D6. The issue is really that you're putting the cart before the horse and trying to force a conversion by yourself. It's one thing to head up a community effort, it's another thing to bypass the rest of Ubercart development to force a D6 conversion b/c "so many people are requesting it." (I'll point out that many people request a lot of things that we decide it's not in the best interests of the project to do.)

I have no problem with you doing what you're doing, but I'm not going to get into the hole of releasing a D6 version of a module like Workflow-ng and have to spend time maintaining that that I could rather spend working on Ubercart. I'm glad you have the time and energy, and I don't want you to feel like your efforts are wasted, it's just a little counter-productive to argue these points while Ubercart 1.0 for D5 isn't even out yet. That initial release continues to be our goal, but rest assured we are making preparations for a full scale D6 conversion as soon as it happens.

You know... we're dependent on CCK for image support, so if you're really anxious to do some grunt work right now, helping them, image field, and image cache get up to D6 would be time well spent.