Gus,
The roof vent will about $140. I have not made any production pieces yet although I have done two prototype setups on cars (I have yet to do MY car!) and all of the tooling is ready.
I should have parts ready in couple weeks when some personal priorities are done.
I no longer do the rear bulkhead windows as someone else has copied mine and now sells them. I refuse to get into a customer battle/price war so I just let him have that market, whatever is left of it. PM or email for the contact details for the window.
I have been a little disappointed in the sales of some of the upgrade parts.......everybody "wants" them but only a few "buy" them............................