megle2
All of the NSCA aircraft (except VH-NSS) were Beech 200Cs with the big freight door with the inset airstair door. VH-NSS was a B200 ex Thiess Bros VH-THS and just had the small airstair door. You are correct that VH-AKV (VH-NSE) had the big door.
If you look closely at the door of VH-NSR in the photo above it has two inset handholds, a flush handle and no hinges at the bottom. I believe VH-NSG is the same.
Rgds