Maybe with the GTAs you can drum up enough firm orders around Europe to go ahead with plans.
Nearly all the GTA turbo pipes are now in production, less one or two minor heater hoses inside the car. I just added another hose last week! However there are still one or two small 'errors' in the kits and they are in constant refinement.
The £190 pipe in question is the same on the A610 so you can buy it already. There are a few different hoses though and I would need 10 orders to produce a full Samco kit for the A610.
Similarly I can also get a GTA atmo kit produced with 10 orders. I can already supply a partial kit but the main rear coolant hoses are different.
I can believe the tooling costs. The last new hose which required tooling was only an inch or so long and the tooling was at least £50. However the tooling costs do not appear to be passed on or recovered in the susbsequent orders as they must be paid in full during development, so only production costs should be reflected in the final price.