I just got one on an invoice sent off to the shipyards: 80 turns? That's... 4x as many turns as the one I ordered (for prototype). I do have the fast prototyping tech, but I don't think it would have made that big of a difference. What sort of tech did you have on it? I just had pretty early tech (starting missiles & particle beams) +impactors & HCL beam modules.
Edit:
http://dl.dropbox.com/u/3061400/MorrigiLV.png
http://dl.dropbox.com/u/3061400/MorrigiLVfront.png
How long are your end game turns taking? At sots1 rates even 20 turns would be painfully long to wait, never mind 80.