Some time back I realised that the tabernacle was very slightly out of true in its vertical plane, so I corrected the bottom edge of the tabernacle and plugged the holes drilled in the forward cabin wall with hardwood dowels.
Here are the plugged holes.
Next the tabernacle was set in place and checked for vertical alignment with a square...
... and a spirit level.
All was well so new holes were marked up and drilled on the forward cabin wall, as here.