It looks gorgeous but unfortunately I don't have Workbench 3.9/3.5 to try it out and offer opinions.
I've never had the opportunity to try out a dopus workbench and it would be interesting to find out how it differs from the Scalos/Classic system I'm used to using in the ClassicWB packs.
You've spent a long time developing this before its official release so I expect it works as well as it looks.
I've offered many opinions and advice towards AmigaSYS 3.1 and hope others will help you out with this exclusive 3.9 offering. Each package is so uniquely different and I think across the range there is something for everyone's tastes.
Well done and thanks for your hard work.