That's certainly what I'd do. Fact is, if something has its own case, leave it there...given the cost of a Eurorack case and how much each hp costs, it's best to leave things that're cased in their cases, and use the higher-cost Eurorack cab spaces for things that require them.
In fact, let's look at this for a bit. Assuming both are Intellijel cabs, and not taking the 1U tiles into account, there's 376 hp of 3U space between these two cases. Then the street cost of those cases together is $1248...so a little simple math shows that each hp in those cabs has a pricetag of $3.32. That's not an insignificant number. So when you take a module that comes in a case (which, since the case is OEM, we'll put that at $0 per hp) like the DFAM, and drop it into a Eurorack case...well, with the DFAM, you're using $199.20 worth of Eurorack case, meaning you actually lose that much money by putting the DFAM in there. Not good!