Making a custom model for Garry's Mod

Hello i am new here and fairly new to blender (about 1 month in) and I can’t figure out how to morph and bend my custom Thor model to perfectly match the male_07 physics model and Valve Biped T-pose for a Garry’s Mod project.

Because Thor is very bulky and has wide proportions, I am struggling to compress and snap his geometry down to fit the tight layout of the default male 07 physics asset without completely wrecking the mesh or the armor placement. I have very little experience with rigging or advanced modifiers in Blender so I’m a bit out of my depth here.

I have packed all the resources into my .blend file and uploaded it to Google Drive so someone can look at the setup and help me fix it or walk me through the correct morphing workflow.

Here is the link to my file:

Any help getting this mesh cleanly aligned and snapped to the Valve skeleton shape would be greatly appreciated! Thank you!