Scale/measurements for custom models

[madmrmax]

If I was to make a custom model in Blender for a VPX game, how do I figure out the scale that I make it at? I don't think I can make Blender understand VPX's unit scale. Should I use standard\imperial dimensions (e.g. inches) or size to Metric (e.g. millimeters). Ideally I don't want to have to scale the model again inside the VPX editor (only position it).

I've seen all the tutorials which are like "here is how you create a custom ramp model" but those start with creating the basics of the ramp model in VPX and then exporting it from there into Blender.

thanks,
mark