(possible) low priority bug:
edit: not a bug, i'll kep the rest of this for the logs anyway:
Sparrowhawk not buildable as Custom production in your colony. All other ships are buildable without problems, it's only the sparrowhawk.
if the ship is "build" at the end of the month, you get supplies crews and fuel as if the ship was finished, but no ship while the ship itself stays in the production queue.
waiting for 3 month at 275k credits production (the ship takes 252 to build) doesn't change anything.
first: i used console command to unlock all techs.
Mods installed:
Console command
Lazylib
GraphicsLib
MagicLib
to reproduce simply play and build the ship, neither with or without cheating makes a difference.