Hello, @FarOutRide. I’m absolutely stumped by how to send a DM in this system! Weird. So I found this post to ask if you’d please send me the STL files for your boom arm sliders and the gimbal you showed in your post that’s now been closed. Please and thanks!
To send a private message, click on someone’s name or avatar & select Message 
You can also select the ‘hamburger’ menu next to your avatar at the top, and select Inbox to see all your messages & send new messages
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Weird. The blue Message button I now can see was not there earlier. But I don’t have a Messages and Inbox section in my hamburger menu.
This may be a function of your status here — will check into that.