Yeah, as an owner of the completely modular Integra Research RDC-7.1, I can tell you that modular sounds good on paper, but in reality nets you nothing but additional cost.

Since Outlaw does not control the chassis, it would stand to reason that they would have to pay significant costs to the OEM to get it modified in such a way to allow modules. And of course once the OEM moved away from the chassis in favor of another, Outlaw would most likely not be able to get further modules built without adding significant cost.

There's just no cost benefit of going modular to either the consumer or the retailer, although the OEM would be only too happy to put it in place for you.