make an 3rd resource system that is harvested like the lumber and gold ( so, 2 systems )
the amounts should be listed in a multiboard (every player should have their own board)
i never saw this system
The reason you never seen that is because its very unsafe to create a multiboard for just one player and for another and I think not yet possible to do so in GUI, reason to why it is unsafe is because it has a very high chance to crash the players.
Oh, also you can modify the basic UI if you've seen warlocks they got a time indicator that does something totally different then what it is surpost to do.