All coming along well.
Quick question. On the septic tank venting, do you plan on leaving it like it is near the house?
I turned our vent pipe 90 degrees and ran vent tubing waaaaaay out away from the house and hid with our hedges. Originally the vents were planned to be near the house like most and if the wind changes a bit the odor can be unpleasant.
Best of luck with the build.