Giant 20' x 3' x 2' router build

[EddyCurrent]

I now have two question, not that it worries me for this but would would you do if that happened on a big job?

The problem is getting back to exactly where you were with regard to X,Y,Z zero positions. This is where Home switches come in, at least you can zero the machine coordinates with these, regarding work coordinates, when I've jogged the machine to where I want work zero X,Y,Z, I make a note of the corresponding machine coordinates from the Mach3 screen so if juice fails I can return to the same place. Maybe there's a better way but that's what I do because it's easy and understandable. You can then run the G code from the start or a line further on.

And second the feed rate is really slow for cutting road runner in foam , I have increased it to max feed rate via the over ride on the main screen but it is still very slow so wondering were I increase it further? In the g code?

Speed for rapids is set in Mach3 motor tunings, then feed speed is set with the F command in the G code, e.g. F800. You can override it while the G code is running using the slider on Mach3 screen.