The acquisition roll for Lathe Wrought Power Armour would be:
Availability: Near Unique, -50 (see combined acquisition rules in main book)
Scale: N/A as we are at Near unique we get no mod for buying one off.
Quality: Lathe wrought armour is mandated as Best Quality, -30
Combined Acquisition (Power armour + 1 upgrade): -5
Total modifier: -85
if your PCs have a hope of making this, then the power level in your game is already at an extreme level…