XTC, thank you very much for your profund feedback.

Unfortunately at present I don´t have much time for answering due to some RL problems.
Well I ended my campaign on Mars. Here are some experiences from my Japanese game:
I had 7 lock-ups during my campaign, 5 on my (Windows 10) desktop consulting the Race to Mars (F10) and 2 on my (Windows 10) laptop with ships that handled an automatic bombing order but seemed to be in and endless loop. Can it be that the F10 crashes happen when there were more than 1 mission at the same time?
XTC, when testing the spacerace for CCM2 I received some freezes too, when visiting the screen of the spacerace. That screen seems to be very instable, but I have no idea how to do it better. The parts of the spacerace have their original places in the screen and their original pediaicons entries. Every idea for improving the stability of that screen is very welcome. It seems that at least in the end you were able to finish the spacerace. In my testgame I was able to start the film for the spacerace victory with CCM2, what, as far as I remember, is not possible for most epic mods for C3C.
Did the space race victory film start in your game?
an attack on a city I had to kill more than a dozen camels which, according to the civilopedia, could have a free upgrade to a Camel Warrior. But the AI apparently did not....
Mostly the basic units upgrade to the next unit in the upgrade chain, as the city that autoproduces these units holds a building with the "barracks"-function. I know about a problem, when supply shipments are produced in the capital and the AI is not able to pull them out from the capital and remove them escorted back to the capital. It´s new that autoproduced combat units were not upgraded in greater numbers, as mostly the same building, that autoproduces the basic unit has the barracks-ability for upgrading that unit, too.
May be there is an interruption in the upgrade-chain for a civ with the camel units. Can you remember, what civ had these not upgraded camels?
harbor and 'barrack ability" symbols are handy, but an airport symbol would be handy too.
Of course such a symbol for aircraft would be nice, too. The problem here is a not very clever programming of Civ 3 done by Firaxis. In standard Civ 3 and C3C the anchor - and the aircraft symbol are not connected to the 'barracks'- or 'veteran aircraft' function of the buildings harbor and airport, but to the trade option of these buildings (sea- and airtrade). If I would give each airport the airtrade function, the turntimes on the bigger maps of CCM games (compared to normal Civ 3 games) would become much longer. That´s why I changed the aircraft symbol for buildings like the palace that provide airtrade, to coins. I think it´s better to make the turntimes of the later game shorter by not giving airports both airtrade and the veteran aircraft ability, but on the other side don´t have the aircraft symbol for cities, that contain an airport.
absence of the armees brought (at least for me) a whole different approach of warfare. But a lot of things from Civilization I happened in my game. A Mongolian catapult destroyed my veteran tank. And my Rocket Launcher was destroyed during an attack on a French musketeer. Enemy WW1 material gave much damage to my WW2 weapons. Every attack of a WW1 plane to my anti-aircraft cruiser gave much damage to that cruiser....
Yes, I did the unit settings so, that even civs with weapons that are somewhat back in technics can have a chance for winning, especially when defending. Of course it wouldn´t have been a problem to give each weapon an additional hitpoint compared with a weapon one level below, but I think this is boring. A veteran tank destroyed by a catapult is impetuous, but even in normal Civ 3 and in every mod or scenario sometimes a situation can occur, when the other unit in a combat has no chance in winning even if it is the most modern unit in combat with a very outdated unit. These situations can only be minimized, but not completely locked out.
Many compliments for the artist who created the I-400 Sen-Toku submarine movement. The first part above the sea surface and during the movement the dive below. Excellent!
This great unit was done by my friend rhodie (who also made big parts of the CCM civilopedia)

and I´m glad that you like it. At present rhodie is working on a great update of his interesting WW II scenario 'Defeat into victory' about the war in Burma/Asia.
having destroyed many happiness giving buildings I never saw civil disorder in a city of the enemy.
I noted civil disorder of AI cities many times in CCM games.
thought I moved my leader Tojo on a transport ship, but when I moved that transport ship, Tojo was standing on water! (see picture). I had a lock-up somewhat later so I couldn't see if Tojo was still there the next turn.
Here I must have a look into the settings of the leader unit, to post more about it.