Aftermarket internals are readily available if you know where to look.
The unfortunet thing about the AEP mecbox is that it has its own special parts, so parts will not be interchangeable with that of regular mechbox parts. As The Staint stated due to their smaller size they have a reduced output for power. Even with fully replaced and upgraded internals you will not achieve any form of output close to that of a standard aeg.
"Its only a little bit on fire"