Some bugs/enhancements (search didn't show these, but some may be duplicates):

• When fleet of constructors go to a location and you build a starbase, I prefer the remaining part of fleet remain on the hex with the starbase instead of being 'ejected'.  This is especially true when the fleet is a fleet of constructors.
• It appears that constructors 'get forgotten' in terms of upgrades.  I think it happens when the available tech of upgrades is exhausted and you have more constructors.  Once you get new upgrade tech, you have to eject the constructor (just one) and redock with starbase to have the existing constructors show up as available for improvements.
• If the starport is going to remain vulnerable and unprotected, you should have an upgrade to starbases to allow for ship construction (you may wish to exclude constructors from this as that would affect balance.)