What size maps are you playing on and 75 turns to build a shipyard is ridiculus I'd rather go back to building them on planets if that's the case?
Insane. But thinking that might matter, I looked at the XML and, nope. It's 250 mp by default:
<Shipyard>
<InternalName>BasicShipyard</InternalName>
<DisplayName>BasicShipyardName</DisplayName>
<Icon>GC3_Starport_Icon.png</Icon>
<Stats>
<EffectType>ManufacturingCost</EffectType>
<Scope>Queue</Scope>
<Target>
<TargetType>Shipyard</TargetType>
</Target>
<BonusType>Flat</BonusType>
<Value>250</Value>
</Stats>
*sees something in the XML*
*checks game*
Wow. Actually, as I look at them, Shipyards are now beefy. 250 hit points, with a base attack of 8/10/5 and a base defense of 16/20/10.
Well, you're getting your money's worth there, that's for sure. Still think I'd rather be able to build them quickly, though. 