
Well it's hard but not impossible.
1. put all resources into a resource.pcx and the shadow file too.
[the icons are already in main conquest directories]
2. map out graphically how you want the combined tech trees to look [mesopotamia techs all may go in ancient] . you may delete some that seem reduntant. i suggest write them out on little squares of paper and arange them out then after testing paste arrows on blank techs [available in creation area]
3. edit civolpedia file and pediocons. cut and paste
4. select a big world map and place initial units/cities/etc.
5. edit rules so 1. most of desired civs are there along with units.
from stone age to modern age - or at least mesopotamia to wwii.
the units32.pcx and the icons are in conquest\art directory. combining would be easier than completely from scratch.
the only trouble is age of discovery vs middle ages: not defender of the faith or the catholic/protest/islamic thing but for game mechanics: you can choose treasure making blgs of AoD or Holy relics of MA, if you allowboth them the relics willl be worth a single treasure shipment. no difference for game. and suggestion the holy pelics behidden in world then return to victory point location [capitols+jerusalem- if you control it.