his patent, if ever approved will be fairly narrowly defined to his particular design.
think about this for a second. how many ZJ's are there out there that want to be exocaged, and will buy a 'production zj exo cage' ?
there are relatively few people in this 'sub market' that want to buy a 'hardkore' zj - those that really want one will probably save some coin and build/mock up their own exocage. a cage that would be more than likely slightly different with respect to tubing, diameter, weld/joint type, angles, etc, etc. and thus not violate his worthless patent, that may never be approved regardless.