A mini-mod

I want to do a quick mini-campaign mod, without changing any skins, graphics, etc., but with a new map, only five factions (minimum, I think?) and a shortened tech tree (only few buildings available)

Did anyone try this before? Any advices, what should I look for, what common bugs can be expected, etc.? We know what the maximum limits are, but are there any minimum limits, apart from there being four roman factions and one other necessary to play?

I have tried it. You can see my problems in
https://forums.totalwar.org/vb/showthread.php?t=40890
with no answers. ~:confused:

I hope you can understand my "English".

Do you want a completely new map or a portion of the existing one?
In case your goal is a new map, you should have the editor by MrHide.

Cheers.