As you've maybe guessed by seeing the hinges on the side, he's designed the bench with two different types of worksurfaces:
The workbench features "Neoprene foam honeycomb tops for assembly and gripping onto sheet material," Holland writes. "The tabletops pivot on steel arms so I can use the plain side for painting/dirty work, and access secondary work surfaces inside the workbench, that can be modified for specialised tasks i.e a router table."
You can see more images of Holland's impressive workshop build here.
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