I work for a commercial construction company and we have our own Xerox full sized copier just like what Kinkos uses (actually is was a refirbused unit that was more than likely used at a Kinkos). We use this copier all the time to reproduce plans for construction where the accuracy is very important. Ours will do a 100% copy and if it did not, we would have it serviced until it did do an accurate 100% reproduction. (The sad fact is the thing does require service about once to twice a week, but we do run like 2,000 feet per week on a normal week and on busy weeks it would not be uncommon to run 10,000 feet through the machine.)

I don't know if there is a law prohibiting 100% accurate reproduction on color copiers, but even that would be doubtful since you can alway use a scanner and a printer for the same result.

I now scan all my plans to a digital jpg file that is a 1:1 ratio so it can be printed at any time. I also archive the original plans so if I need them, I will have an original set undisturbed.

For my TF GS Corsair build, I have used the JPG as a background image in AutoCAD and I am redrafting some of the parts to be more scale accurate and I will reprint the plans once I am done.