Nothing wrong with quality, but in Porsche's racing cars the quality was in the engineering. The detail finish was crappy. The restorations and replicas are going to a level of finish that Porsche never bothered about.
If you need parts for your 906 project, like chassis, wind screen, rear window, etc... I can get them. I just finalized a deal six months ago to be the North America Dealer of 906 cars and parts.
I have optained all the original factory molds and blueprints from a retired race department employee. I currently have three chassis and bodies done (one which is mine) and am finalizing the manufacturing of the small parts.