I have included two saves. The first one from when I finished the requirements and one after a whole lot of tweaking.
Also in the ZIP file is a gif showing the development over time.
No special goals on my side really. Just finishing the mission and build something I like to look at.
Played with Julius on very hard with god effects on. Bugfixes for ghosts and very hard early immigration were on. I also deactivated the goals and favor decay for an easy fast forward later on. I did temporarily use 2 barracks to replenish towers.
Final version looks approximately like this (I did some more tweaking afterwards): https://cdn.discordapp.com/attachments/831561280333545482/1084783755182489660/Reaching_Marble_Island_v2.jpg