I was able to use one set of accessory electrical wires buried at the beginning of construction.
I cut away the foam around the wires and put in an electrical connector block.
(https://i.imgur.com/fXJtqZr.jpg)
I built my first O scale structure, a shed from Banta Model Works (nice kit) and put a warm LED light in. I cut a groove to the structure in the sculptamold and wired the light.
(https://i.imgur.com/TVv5Moa.jpg)
Here it is lit up.
(https://i.imgur.com/9om2C9B.jpg)
(https://i.imgur.com/mW1Nqgx.jpg)
I will fill in the groove and “dirt in” the structure. The electrical connector hole in the ground will get a styrene cover and for awhile be removable for wiring the other structures to come in “rail camp” the backwoods headquarters and service facility for the Kittom Lumber Co.
Thanks for looking. Doc Tom