I've decided that instead of modeling the F40PH-2C, I'm going to model an MBTA GP40MC. I'll be starting off with an Athearn GP40x, but I know I need to lengthen it. What size of sheet styrene matches up with the Athearn shell is my question?
The reason I ask is because I need to lengthen the GP40x to fit over a Dash 8 set of chassis since that's the closest to the length of the MBTA GP40mc. But I think I got my answer! Thanks guys, I do appreciate the help!