Looks good Kee. Any thoughts of adding a ball lock post as one of the output options? You could keep this in rather than the plug so it is still sealed when not in use while having a secondary connection option while travelling.
Undoing the grub screw is really easy to do. On the unit I have at home I have actually changed the grub screw with a small wing nut so I can undo by hand and remove the as line this way. So I think because the plug can be removed so easily like this I don't think an actual ball lock post is actually necessary for quick disconnection. The ball lock post would add a small amount of cost but I really think once you try it you will not find it to be necessary.
If however we get enough interest for a ball lock post it's certainly something we would be happy to make but it just would be at some additional cost. Probably about $10-15 extra.