Impressive. Once you're able to, you should go check out the Handbook section, and maybe post some of your work there. I'm sure many would appreciate. Liking Monstrous Characters, i'm sure that i would appreciate information on playing monstrous characters.
Also, Code to update monsters? I definitely want to check that out. Welcome.
The code is incomplete, and mostly involves spreadsheet tricks and shenanigans. ... which, looking back on it, I've mostly forgotten how to use.
I'll send it to you and answer questions if you want...
I advanced several monsters with it, once, according to core, and have stats for max advanced monsters for just about every monster in core. *looks at his advanced beholder... 346 hp, CR 20, Eye rays save at DC 30 ... O.o)
It's kinda the reason why I started moving toward E6 gameplay. After I felt I "mastered" advancing monsters, I realized it was a neverending quest for balance, and the 1st 6 levels were a useful limitation to work within.
Where can I post something like that - advanced monster stats? It's in spreadsheet format, so you can sort it by CR, HP, monster type, or whatever you want.
That - a big spreadsheet - is also what I have for my fixed Anthropomorphic Animals from Savage Species (+4 Wisdom -4 Cha for all anthros?! seriously?) Is that homebrew or handbook?
Reworks, Fixes, and Variant Rules perhaps?