Let me introduce you to Tiberian Sun: Tech Level War. It's a mod with a new gameplay tweak, in which you have to build very expensive buildings - the tech centers - in order to level up and have superior buildings and structures and eventually win the battle. However, there are not useless units in the lower tiers.
First moments of a game. I choose Deffensive class, so I trained some grenadiers to defend.
Nice documentation, a vid may been better but this shows the mod good too. Also you can upload up to 10 images at once, they then however share the same name and description but you can edit it afterwards.