I whipped up another custom model this afternoon, compiled it, and imported the running animation sequence.
This is because his hips and shoulders are wider than the standard Valve biped.
When I hold down CTRL in Source Filmmaker, I see my model has the standard pelvis size:
Rather than my custom pelvis size:
My question is: can I modify my SMD or QC file to create a custom pelvis size? If so, where/how would I start?