In general, I like this add-on. Multicraft default is pretty much garbage, so this is a nice change of pace. It has a much more professional look. My one complaint is that it doesn't scale on high res systems. I run very 1900 on my desktop and it sits in a box in the browser. Usually, you will get scaling that stretches to fit the browser. This one doesn't do that. I'm not sure, but I don't think I noticed this issue with default multicraft.
Just bought the current version, and was wondering if it works with 2.1.0 before I install it. I currently have Multicraft 2.1.0 installed. Also am definitely interested in your PRO Template custom features.