I decided very early on that before any layout benchwork was built, I would have a finished basement (walls, floor, ceiling). I want a comfortable space for me and my operators to enjoy the layout year round. So, step 1: frame up the utility room and dividing wall for the layout!
Furnace room framed up:

(All those boxes are full of train stuff)
The wall that will divide both upper and lower main lines (plus a generous amount of Hoard)

Drywall is currently hung, and with the layout occupying most of the outside walls I only need to mud and tape a small section, which is good cause I suck at mudding and taping! All the drywall will get painted to seal it before the layout goes in.
And part of the loco fleet sits locked in their boxes, waiting for the layout…..
