Construction Costs? Options

[Mithral MAge]

I have a player who wants to make himself Body Armor, with all enhancements in the core book other than Thermal at rating 6. He definitely has the skill, Armorer 5, but what I can't find is how much the materials will cost him. He already has a Facility (He used the Weapon Specialist written up in the book as his character template), so I could just rule he has all the parts on hand, but I know the other party members will want him to make it for them as well. So I want to know if there is an official way to price items? Right now I am just assuming half of the final cost as the cost of the parts.

IE, 10,000 nuyen retail means $5,000 cost to construct.

Now what if he wants to fabricate everything from raw materials? He does have a Facility, so I imagine he has all the machine tools, forges, and machines he would need. At least for armoring. I would imagine that would reduce his costs to as low as 10% of final retail, no higher than 30%. Is there anything in the rules, beyond the core book (or in it if I have failed to find them) about this?

Plus how should I describe the facility? Would a facility be big like Orange County Choppers newest facility? Older facility? Either would work?

I mean I have seen machine Shops that could pretty much do anything they needed, so I don't really feel clear on the difference between a shop and a facility. It seems to me it would be the machinery. I don't see a shop having everything for 5,000 nuyen, unless they were great at doing auctions. So am I correct in assuming that it is the machinery that is the difference?