This is the third part of my Secret Scuba gift for Leefish. Lee happened to mention (before Secret Scuba was conceived) that she'd like the BG Justa door recoloured in the medium wood from AL. So, I recoloured it and did the light wood version too (the dark wood proved too hard for me).
Found: Build Mode > Doors & Windows > Doors
Base Game: ValueWood Lumber's Justa Door: Price: 80
With thanks to Kiri for helping me with the textures and Klaartje for spurring me on.