I agree that nobody is likely to build a new SD class solely to add Streak drive.Weird Harold wrote:SDs will eventually get Streak Drives, but existing SDs can't be retrofitted and new SDs are too expensive to build just for streak capability because it doesn't add any combat capability.
But we know that Haven and Beowulf both want fully modern (read Apollo-capable) SD(P)s, and even Manticore (who just finished a python lump of them) it looking at 4th gen SD(P) designs with further enhanced survivability. So it seems from what we've been told in the books there will be a steady stream of new build SD(P)s for the GA.
Since that's already the case it makes sense to reserve room to retrofit them with Streak drives once it becomes available and tested.
Whether it makes sense to retrofit current Apollo capable SD(P)s would depend on a lot of factors we don't know (basically boiling down to how much yard time would it take to retrofit a GA varient of the Streak Drive and how much would have to be pulled out to do so) And since we don't know the actual size of current hyper drives, don't know if the GA streaks will also be double the size of the GA hyperdrives, don't know where the current hyper generator is located, nor what's around it, we've got no way to more that blindly guess at the level of effort.
The unbelievably best case for upgrading would be a hyper generator adjacent to the pod pay surrounded by store-rooms. You could cut in from the pod bay, minimizing the amount of armor to deal with, and stores can be fairly easily located elsewhere giving great flexibility on what to give up to gain that volume.
The worst case would probably be buried center-line inside the forward impeller ring, and taking up most of that diameter. That would mean lots of high power circuitry, lots of armor cofferdams, and no room to expand the volume without redesigning the impeller rooms to be flatter (and consequently) wider.
But those are just two, off the top of my head, extreme examples. If it's as easy as the former it probably makes sense to refit it onto SD(p)s the next time they're in for a major overhaul. If its as hard as the later it's not worth the trouble, just eventually build a 4th+ gen SD(P) to replace it.