Just Rules aims at increasing the strategic options in RA3. It includes things like a more balanced upgrade system, revised protocols and build limits on each unit design to discourage spamming and encourage diverse unit formations and strategies.
Each tier 2 and 3 unit will now require its own upgrade. Each upgrade requires either the tier 2 or tier 3 upgrade from the ConYard. The upgrades have been code to be bought in any order or combination. Sorry, the Barrack in not include yet as I still have to add the Archer Maiden.