Hi FV,
Skinning the outside of the cabinet on the A5/A7s has been done over and over again, and it's a good idea. If you intend to paint them, you can get a nicer finish (with lack of grain print-thru) by using 1/2" or 3/4" MDF. It really stiffens and adds mass to the cabinets. Even if you intend to veneer them, the MDF makes it an easier project. The only way I would go with plywood is if I had concerns with either weight or exposure to moisture.
As to re-enforcing the bass horn, there are lots and lots of threads here, on Lansing Forum, and Audio Karma discussing the process. Others with direct experience should be chipping in with their experiences and recommendations.
Would love to see pics of what you have, along with pics of the guts, too, if you have them. Never get tired of looking at them.
How do you intend to use yours? In home hifi? If that's the case, be sure to check out the many, many crossover mods you have at hand. Massaging the crossover and properly re-sizing the vent, along with re-enforcement, seem to be the most popular mods for making these sing in hifi applications.
GeeDeeEmm
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