Hm, I feel like that UI is kind of overdone. (surprise much?) I like the idea of it basically transforming the tile into a Hill and I like the idea of it benefitting siege, but I think the regular combat bonus for siege, and particularly the combat bonus for ranged units, it's simply too much, thematic, sure, but sometimes it's better to keep things simple. I like the Mangenik, but I sorta feel like it coming with Cover 1 is sort of overkill given that it already gains defensive terrain bonuses anyways alongside the civilian unit bonus. The UA, more often than not I don't like much bonuses that boost improvement construction rate given that Liberty already makes it damn fast on its own, and I don't feel like gaining gold from idle workers is really useful at all(?). The last part of the UA I also found somewhat uninspired, sure a powerful bonus, but extra experience from buildings in the capital is just... well, just meh for me.