Improved model with thicker wood panels (18mm) and more details on the aluminium plates.
It will feature an internal "compartment" in the middle where the fan controllers and cables will be hidden. The structure will also function as a backbone insuring rigidity to the case.
Since every side can be accessed it should be rather pleasant to build in. The outer alu plates will be held by magnets, whereas the inner ones (holding the fans) will be mounted with screws to the wooden parts, but can be removed from the outside. The two "doors" on each side will be held tight by some form of key hole hangers at the top, and screws at the bottom (mounted underneath, thus not visible). I will most likely trim all edges with a round-over router bit. The two wooden joints at the top will be dovetails, but I guess only the half blind type.