[Suicide Junkie]

And what if you have a great design already and just want up upgrade the mounts?
In P&N, you can use Quality mounts, which don't change the size, just the strength (& cost) of the component.
Adding 40% to your armor strength is a major change, but involves only mount alterations.

Having to make two retrofits and have an extra design cluttering up the shiplist is bothersome.