I think it would help construction tremendously if we had the possibility to copy an entire furniture group - provided that you have all single components of that group in your bag of course.

This should work as follows:
I buy or construct all items a second time that I need for that specific group. I take care that it is all inside my bag.
Now I go to the bound furniture group that I want to copy (or I create that group if not done yet), I put the focus on the master item like if I want to do position manipulation but then I press a specific button "Copy group". After a safety check if I really want to copy it I get a copy of that group which is an exact copy of that group and which has the same bind setup as the copied one. The focus is now on the master item of the new group and I now can place it where I see fit.

I see two restrictions:
Restriction 1 is: I did not prepare all furniture items necessary for the copy. There could be now two possibilities: Either the copy is incomplete and the missing items miss in the copy and I get a notification about it either prior to the safety check or posteriori (prior is better I think). Or I can decide to automatically add the missing items by consuming the necessary crafting stuff like mundane runes etc. If the crafting stuff is insufficient the copy will be made incomplete.

Restriction 2 is: I may exceed the maximum number of item slots with that copy. In that case the items that are too much will be left out and I have an incomplete copy. A warning prior to safety check would be good I think. The items that are left out should be those that were added last to the copied group.