Guidance for making custom ships?

[Yodhrin]

I'm considering putting together a few custom vessels, to represent campaign NPCs/scenario allies and to transfer some vessels from a mate's Rogue Trader RPG group into BFG, and I'm wondering if there's any VDR-esque systems for determining how to point them?

[horizon]

You should do a google (or similar) search for the pdf called The Smotherman Formula. You can see that as a rough guidance to determine point cost.

The best steps to take are:
 

• Use smotherman for base value.
• Compare value to comparable existing vessels
• Fudge points, always + a little
• Playtest to determine value better