Update
Mike - Thanks for your encouragement. I'm really looking forward to this.
Rails of SW Iowa - Thanks for the offer of info. I'd love to see anything you might have for the segment I'll be modeling. Any chance you could share your name...or just your first name?
Andy - Thank you! That means a lot to me. But now I've gotta ask...what's the RR nickname you earned on the Rover? It must have been good if you're keeping it quiet. 
As with a lot of home sales around here right now, ours went fast. The current house went on the market Tuesday and we had an offer for over our asking price first thing Wednesday morning. So here we go!
Visited the new house again. One of the advantages of buying a model home - we can take more measurements and pics every day they have "visiting hours"
. Here's the future train room end of the basement:
In the lower right corner you see the stairway up to the main floor, and just to the left of that, a hallway back to a bathroom and storage room. Toward the back on the right is the door to the utility room with the furnace, A/C, and water heater.
Plan A was to partition off that entire end of the basement with just a single door into the layout room, meaning the only access to the utility room would be via the layout. That might have been okay if I only needed to access that room occasionally as long as I made the lift-out and aisles wide enough to accommodate an eventual need to replace all that big hardware.
However, over time I started to realize that not everything I was considering for this layout was going to fit with the amount of "breathing room" I wanted between towns. The solution I settled on was to use the utility room to house the ADM elevator at the end of the Atlantic Spur, as that would allow me to move staging closer to Atlantic. With that, the idea of using that lift-out to access ADM, and the impact that would have on the Adair scene, started to lose its appeal.
Plan B is to make the utility room door accessible via a hallway outside of the layout room. This would shrink the bottom right portion of the layout, but I could more than compensate for that by moving the new L-R wall we're adding a couple feet further into the family room. That still leaves plenty of room for the latter and generous aisles for the layout.
While the two elevators won't share overlapping space in staging as a place to spot empties, I'll still be able to model this practice by way of ADM's spur in the utility room and Adair's dual stub tracks extending into staging.
Here's a rough sketch, not to scale. A few notes:
- The layout entry door is indicated by the dotted lines for the swing gate at the bottom
- The dark gray in front of staging represents the high view block fascia like I've used on my current layout - short enough to reach over, but tall enough to block our view from most vantage points
- This plan will allow the main portion of the layout to be built with just 8 new turnouts, plus another 4 for Harlan Elevator. It's possible that a handful of additional turnouts would need to be rebuilt at the extreme ends of the Atlantic LDE as well, but I should be able to rebuild staging using only components recycled from the existing layout.
This plan for ADM will also have the advantage that I can use the track passing through staging to represent the elevator until I get around to building the utility room extension itself. Also, the prototype Atlantic Spur has a gap where it's inaccessible from public roads in the area where the model is passing through staging out of sight on the layout, so as a train of empties is shoved up to ADM at a leisurely pace, it won't seem unusual to lose sight of it while the operator walks out of the layout room and around to the utility room so they're in position for spotting the elevator.
Finally, I had to share a pic of the newest model railroader in the family. Our 3-year-old granddaughter Quinn has been visiting for the last three weeks, and thanks to a recent ride on a museum railroad near her hometown of Las Vegas, she's developed quite an interest in Thomas the Tank Engine and all trains. As you can see, she takes her model photography (with her toy phone) pretty seriously.