Terry post the file as Txt file and I'll take a look.

The road runner is set for imperial units so it's correct that it would be small if using metric units. ie 1 inch would equal 1mm.
If you want to see the road runner cut correctly then type G20 in the MDI before running the code. Warning check the extents to make sure it will fit within your cutting area. Also Type G21 after it's cut to put you back in Metric.

Regards your G-code Did you use Post processor designed for Mach3.? And was it Metric.?