There is a constructers book which I have had for years - The Eminence Loudspeaker Enclosure Book, it has all the designes you could imagine, folded horns, guitar cabs and explains all the theory as well.
Gone are the days when you just put a driver in a box and hoped it sounded good but sometimes experimenting can get good results.
That would be one massive cabinet with those three drivers in..you would need a fork lift truck to move it.
Nowadays we have access to all these components and can have a good at building cabinets, in the old days you couldn't get hold of quality speakers unless you were a musical supplier