Spire Corvette Ship Design - Mark IV: Can't make custom designs

[resonence]

In a recent game, I unlocked the Mark III version of the Spire Corvette. I had also captured an Advanced Starship Factory, so I had access to the Mark IV version as well. However, in the Ship Design tab under controls, I didn't have an option to create designs for the Mark IV, even though I could build them.

Am I just missing something, is it a bug, or are you just not supposed to be able to make mark IV custom designs?

[Marmu23]

 Furthermore, the spire corvette mk5 from the fabricator doesnt have an entry in ship design either.

[keith.lamothe]

Yea, I've been meaning to address these but it kept slipping through the cracks; it's on my list for the next release now, though.  Thanks for the reminder