[GrimJosef]

There are kits which supply only the drivers and the electronic components for any crossovers. There could well be plans, or perhaps just dimensions, given for the cabinet but the actual woodworking is left to the builder. My experience of such cabinets is that commercial manufacturers don't over-engineer them. They use the lightest material they can get away with (sometimes for the good, if the cabinet behaviour is managed as part of the overall acoustic design). Home constructors, however, can be tempted to work with the stiffest/heaviest material they can afford (or lift !). I have come across cabinets like this that would survive artillery bombardment.

Cheers,

GJ