You could make a fork and everytime only replace the modinfo files and add or change a few units / unit stats.
For example:
* Only give metal makers.
* Give coms dguns and include dgun range around your base.
* Add a few ( maybe 5 or less ) new support units to different factories ( for example amphibious ).
You have a mod with some new featurs and have to get the main game + patch it every time.
After that upload it to make it accessible over rapid or springfiles.com.
It is easier to implement a mod option ( experimental units ) and add all the units from a specific developer ( or one factory ).