Because large part of the Amuni settlement attaches to existing structures (e.g. residences and workshops), the layouts would be highly dependent on what do you already have in your city and/or willing to keep. There are no level requirements on attachment points though, so you may as well attach GS and TM to temp L1 structures if that works better.
Also, you do not necessarily need the max settlement. I never built the last temple (it is unlocked pretty late in the chapter), and as such didn't have max upgrades to GS and TM (even though I had 8/4 setup). This was more than sufficient to get through the chapter in about a month with no techlock.