That is actually not a bad idea... Repair drones are just construction drones not currently building anything.
Thinking out some consequences,
ships carry construction drones with them, this allows them to self repair on the fly, but the ability is limited to their on board resources and quality of the drones. Because smaller ships have smaller cargo holds, they have a harder time repairing themselves. It would be a judgment call for how much to allocate for self repair / construction ability.
rather than returning to a ship yard, a fleet can drag along a ship filled with construction drones and materials, and it becomes a sort of medic/ on the fly engineering heart... A valuable target indeed.
Station hearts could carry a small army of these, and when construction is over, they simply become the maintenance crew for the station and those who dock there without changing anything.
Breaking the repair shop / construction barrier means that even a tiny fighter with a single repair drone could conceivably build a defense perimeter or a jump gate or a capital ship... If it had the time, resources, and a capable enough drone...
Challenging your assumptions is good for your health, good for your business, and good for your future. Stay skeptical but never undervalue the importance of a new and unfamiliar perspective.
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