I don't have time these days to investigate it, but the first thing I would do is follow @Stan` advice and study how it's implemented in the garrison 

The ramps and ladders are interesting but would be somewhat difficult to animate, hence the idea of making it a passive bonus or tech (i think siege ladders are already a technology, or at least they are in the DE mod). One interesting tidbit about earthen ramps is that the famous Assyrian towered rams were apparently mainly used on top of such ramps to damage the enemy battlements. Does this mean the Lydian ramp was meant for rams? perhaps but there is no definitive proof (Rams built in the "Hurrian manner" are already mentioned in Ḫattušili I's siege of Urshu so they might not be entirely new to Anatolia) This is a quite interesting siege method for civilizations without heavier siege equipment; again a bit dificult to implement (and i'm not sure how much it was used in archaic period itself). Although perhaps it would be possible to implement a simpler ''underminer'' unit that attacks enemy walls with the villager's pickaxe.

Indeed, surely this started early. For the ram I mentioned, Thucydides states that the defenders "snapped off the nose of the battering ram", implying it was capped, probably with metal like the Olympia ram, which is from around the same period. There are plenty of engagements for which there are no records, but in any case, attacks were usually concentrated on the gates.   I don't see that as desirable, but other possibilities could be: -Spy units hard to see to the enemy, which I proposed recently, could open gates. This is not some far fetched Trojan Horse thing: "political factions aiming at the overthrow of a government could render invaluable assistance in several ways. One method was the opening of the gates of a city under siege. Another was to make it possible for enemy forces to enter the besieged city under the cover of darkness. An excellent example of this is provided by the siege of Plataiai. According to Thoukydides (2.2.1-3), a force of three hundred Boiotians entered the city at night with the aid of Nauklides and his friends who opened the gates for them", from Espionage and Treason in Classical Greece, by A. Gerolymatos. -Later on, siege ladders could be considered, since apparently they "are mentioned in a fragment attributed to Archilochus" ca. 650 BC. -Even later, around 585 BC "the Lydians, presumably under Alyattes II, took Old Smyrna by building an earthen siege ramp" (which included wood). Maybe the Greeks learned from that, but their use by them is not attested until over a century later. -On top of all that, initially walls would have been made mostly of mud-brick, which "resting on a low rubble socle, was not very high or very strong", from Ancient Greek Fortifications, 500-300 BC, by N. Fields. This would have made "climbing the stone and mubrick walls" feasible at some points (as mentioned in the Iliad), where their slope wasn't as steep. For game purposes these points could be where the walls take a turn, and some units could be able to walk over them (at a great speed and resistance cost). In any case, at some point "all-stone fortifications became more common", allowing for taller and steeper walls. Still, there's an interesting difference between both kinds of materials, although maybe hard to implement in the game: "against the blows of engines brick brings greater security than fortifications built of stone. For stones break and are dislodged from their fittings; brick however, does not suffer so much from engines, but it crumbles under the action of water just as wax is melted by the sun" (the last method being how Sparta took Mantineia).

Just downloaded it and tested it. I saw a mod that was yellow, some green, and some white. Also, the check for updates button worked. It seems to be working for me. Maybe being able to update mods from the main mod menu would be nice (though, it takes 5-7.324 seconds to get to the download page that it probably doesn't matter, and if you need to agree to the terms and conditions) Can that be a Pull Request?

Ok thanks @guerringuerrin! Would anybody want to help me with adding the eject units on boat death? Also, the PR is #9211