I have not committed to digging for the magma source, and still in the middle of deciding between pump stack or magma piston.
The issue with magma piston method is I want to use a digcircle pillar of 13-tile radius for aesthetic and difficulty factor. But there is about 10z worth of imperfect pillars that I may need to dig out and let it be removed from the pillar's use. And doing so, my pillar will be 10z below the surface of where I want the magma to fill my ever complicated moat.
I also have the option to use a more simple rectangle, but I would lose the circular architecture. And another option to use the planned pillar and build the pump stack here instead.
So while I construct the above ground (magma) moat walls, I am on my 2nd batch of 30x green glass tubes and corkscrews. I would need around 120 sets of screw pumps.
Now, since I am doing making progress to go the pump stack way, I started thinking of expanding my "ocean water power generator" with some `ugly' rectangle bunker style architecture . I added raising bridge to shut close the water source pipes just in case zombies from his haunted ocean come visit--I would not want them hanging around my power source"
With some power available, it was followed with some more (+3z) above ground constructions to house the water "pipes" and cistern for the option to make obsidian casted walls.
--
Oh yeah, one more note. I set my cap to 200 initially, with 1:1 child pop. One of the first migrant wave child grew up to be a peasant already. I still have a military of 2 training instead of doing hauling and constructions. I am still getting migrants waves. I may need to divert the temple construction into my planned community above-ground housing over the 2 'reserved' heavily forested 48x48 tile areas. I may just go for 3x3 2-story houses using obsidian instead of orthoclase blocks. Definitely wood floors. Ahh, this may be a good project to use silver and gold bars.
I only have 3 bedrooms assigned. I only have around 24 3x3 bedrooms, and 24 2x2 bedrooms, but all are unassigned. Why? The temple isn't ready! I'm sure I'll make more living quarters after I figure out how the magma moat plays out. Maybe a nice flat next to an infinite magma pool facing east for the "deity of dawn" portion.