Our ISO 9002 standards specify our boards must conform to IPC-A-600 Class 2.
Sometimes job files for old boards cannot be found or it was done in the old tape-up days. We can reproduce a board based on a sample only, if it's single or double sided and if all the parts are removed so we can measure the features. We charge PCB design services by the hour though, so it's usually cheaper to lay it out again. It's only cost effective for simple designs.
Yes, over time Omni will be re-publishing the original articles for your reference. You can find them by following this link: Omni Archives.
Recommendations for PCB storage and handling can be found by following this link: storage and handling.
The Omni Circuit Board DRC Conflict-Free Sourcing Policy can be downloaded here.