Some modding questions

Hi I,ve been trying to make mundus magnus 2 vork with RTW1.3 BI for some time now and can't seem to manage to i've even tried the mod switcher and nothing is it or isn't it possible?
Is there any guide to adding buildings especially adding a 4-th level to barbarian (also in RTW 1.3 BI)
Thanks for your help

I'm somewhat of a modder myself, and so far I've concluded that in order to get MM2.0 to work on 1.3, alot of changes need to be done. I'm going to wait it out, and let the MM do it for me.