This forum is about the 6502 family of microprocessors. Are you wanting to control stepper motors, valves, and other things with a 65xx, and read an oxygen analyzer and other sensors with it? Please be specific. I have not done mechanical controls like that, but I have done many electronics work and hobby projects with my workbench computer shown at
http://wilsonminesco.com/BenchCPU/ . It could be used also for things like you seem to be talking about, but I want to make sure you understand what this forum is about. I and others here do SMT layouts, but I don't think there is anyone here who is involved in the commercial manufacture of PC boards.
One other thing: What is this "sth" you have mentioned a few times? At first I thought it was a typographical error (typo), but now I don't think so.