Some random questions

[Alexandr III. Biges]

[QUOTE=anti_strunt]Some more random questions:

1. Can more eras be introduced? Could I, for instance, create a new "Renaissance" era which would start in 1500 and introduce a bunch of new units?

Yes, take a look, this is from Hellenic total war conversion (the start of campmap/startpos/Hellenic_CL.txt file):
//========================================
//campaign name can either be text or a
//label. Set predefined accordingly
//========================================
cn_predefined:: FALSE
cn_title:: "Classical Era"
cn_short_title:: "Classical"
//========================================
//campaign description: can either be text
//or a label. set predefined accordingly
//========================================
cd_predefined:: TRUE
cd_line:: "Era_description_Classical"
//cd_line::
//cd_predefined:: FALSE
//========================================
//hidden : set to true or false
//true means it won't show up on custom battle screens
//========================================
cd_hidden:: TRUE
//=======================================
//
// Set the sub-directory where this
// gametypes map files can be found.
//
//=======================================
SetMapTexturesSubdir:: "Hellenic"
//=======================================
//production files to be used for this
//startpos
//=======================================
Prodfiles:: UNITPROD "Hellenic_unit_prod2.txt" BUILDINGPROD "Hellenic_BUILD_PROD2.TXT"
//========================================
//Start Date
//The year in which this
//campaign will begin
//========================================
SetStartDate:: 450
SetPeriod:: LATE
SetEarlyPeriodStartDate:: 100
SetHighPeriodStartDate:: 250
SetLatePeriodStartDate:: 450
SetGameEndDate:: 550
-------------------------------------------------

2. What is the maximum number of units? 300?

I think it must be less than 255 plus maybee some are reserved, so consider ~ 200-240

3. Is there a maximum size (just pure size, not number of provinces or anything) for the campaign map?

Don't know, probably not.

4. Can factions be made to start a campaign as allies or at war with eachother?

No, this is known problem, you would have to make a save game with this, than a player may choose his faction via debug commands.

5. Can buildings be linked to eras?
Thanks again in advance for all replies.

Yes and no. Each era has its specific configuration file for building, howeve, when you start early era, you can have all buildings in high and late. But if you start High, you have another conf. file, which may introduce different buildings.
Take a look in txt files in your MTW directory, these with "PROD" in their names.
And download Dragon MTW Editor, there's related topic in mod forum. :)