What material covers the front surface of the Adept models and can they be painted?
It is also fabric, and it can be painted. The paint can extend around the entire frame, but should be avoided on the absorptive part on the rear. The demarcation of the two surfaces is obvious.
Alternatively, you can pick any fabric you want from your local fabric store, and simply use a staple gun to stretch it around the product and affix it in place. Done with a little care, you can't tell at all that it didn't come from the factory like that, as the ends of the fabric will all be hidden in the rear.