There is an easier way...
If you just want it bigger, then go into the characters FPE file and change its scale value.
For instance, the Thug unarmed model has a scale=80 in his FPE file.
Change that to scale=180 and then place it in the editor. (you can scale it to suit your specific need)
Make sure you delete his .dbo or .bin files if they are there before you run the editor.
That will force FPSC to create new .dbo and .bin files that will reflect the change you made.
Just be careful to make sure its a big room and his head won't hit the ceiling.
This is easy to do and you won't have to re-animate, as he will retain all his animations.