On to the next build.
I'm really not sure how I want this to shake out, except for one single idea: I want the "road" to turn 90 degrees and run partway through the middle of the building. Just cause that sounds kinda cool.
So, here's a rough outline of that, with as much foundation space laid down as I could place, without clipping into ground or other non-removable obstacles.
Actually, there was ONE other idea I had, and that was that I shouldn't have independent machine lines (I.E. line of furnaces, line of constructors, etc.). At least not fully. That's because for the 2 products I'm making, I need both Foundries and Constructors, and the number of each that I need is ALMOST equal. So, I actually want all of these machines to be 1:1 paired.
From that, I realized... I haven't built machines stacked on top of other machines in a LONG time.

So, yeah, I'm gonna build Foundries stacked on top of the Constructors they feed to. I built out a few little prototype ideas of what that might look like.

Ultimately settled on this. Just a standalone elevated platform above each set of Constructors, supported by pillars, and with catwalks for traversal. Very tightly-packed, as it turned out.

Also need a line of Iron Ingot Furnaces to feed both sets of Solid Steel Ingot Foundries, and at this point, I realized that if I elevate those as well, that leaves me with plenty of space to fit Storage Containers and Dimensional Uploaders underneath them. So, that reduces the footprint of the whole building quite a bit.
With those all laid down, I added some interconnecting catwalks, and a main staircase to get up to them, at the back.


Some close-ups of the center structure.

And since the Steel Pipe line of Constructors is shorter than the Steal Beam line, that leaves a perfectly-sized corner of the building to fit the overflow sink. I decided to go ahead and cut open the main floor to have it sit on the maintenance floor, and make this the maintenance access point as well.

Wide shot.