You can find my MaxBiped rigs in the links page, and the source/compilation files are in steamapps/username/sourcesdk_content/tf/modelsrc/classname/scripts/
Assuming you use 3DS Max all you have to do is remove $upaxis Y, and, right above the first Valve-set sequence
Code:$upaxis Z $sequence blahblahblahitsmine $sequence imadesomemore $upaxis Y

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