Can't take over most derelict military ships

[stancollins]

I can't take over derelict military ships except Frigates, even after I've researched the techs to build capital ships. DW:U Version 1.9.5.3

[Nanaki]

You have to send constructors over to repair them.

[Mansen]

ORIGINAL: stancollins

I've researched the techs to build capital ships.

There is no such tech - Aside from the Resupply and Carrier ship roles, the rest of them are exactly the same. The only difference is that the game has pre-designed ships for each role.

You can make tiny Capital Ships, or Escorts the size of the biggest ship you're allowed - It's just there to help the AI define their attack/defend roles.