Building Ships simultaniously to buildings (shipyard)

In my experience the current game encourages you to build a few very powerful fleets and afterwards carry on improving your systems.

In order to enhance lategame fleetbuilding and combat experience, I think it would be a very nice idea to introduce a military shipyard in the military research quad, that you can build in your systems.

Systems with a military shipyard are able to build upgrades and ships at the same time.

A shipyard would have very high upkeep, or should be a unique building, in order to ensure that it s not overpowered.

Adding to this it concentrates, as the name suggests, on military ships. E.g. colonyships still d have to be build the normal way.