Max,

FWIW, I think you should charge $ for this. It's very worthwhile. A similar type plugin, Artisan, for SketchUp is commercial. I know the guy who wrote it. Like you he had given lots to the community. By charging for one plugin, it was a way for those in the community to help support his continued efforts. And, as we all know, a 'contribute PayPal' button doesn't do very much these days.

Thanks for your tireless contributions! Really good stuff. :-)