Since you want the overlays to already be in the scene from the beginning, just add the overlays next to the background name.
INT. GRAY with NEWLABS12 to 0.838 -79 21 in zone 1 at layer 1 with LABBARS to 0.838 -79 21 in zone 1 at layer 2
Since you want the overlays to already be in the scene from the beginning, just add the overlays next to the background name.
INT. GRAY with NEWLABS12 to 0.838 -79 21 in zone 1 at layer 1 with LABBARS to 0.838 -79 21 in zone 1 at layer 2