Custom skin and Wheatley looking at player help
Attached to this post are all the files you need already prepared. I hate to do things for ppl because I would prefer that you achieve it by yourself, but at least you tried hard 
It's a zipped file with 2 folders: materials and models. Those folders go into portal 2/portal2 so copy that file and unzip it there, and when it asks you to combine folders say 'Yes'.
As I told you above, after you unzip this file the way I just explained, you'll have these files for the models (into the folder materials/models/npcs/arachnophob_sphere):
- personality_sphere.VMT
- personality_sphere.VTF
- personality_sphere_glass.VMT
- personality_sphere_glass.VTF
- personality_sphere_light_damaged.VMT
- personality_sphere_light_damaged.VTF
- personality_sphere_clean.VMT
- personality_sphere_clean.VTF
- personality_sphere_lights.VMT
- personality_sphere_lights.VTF
If you only need 1 custom eye, just name your custom eye VTF image personality_sphere_lights.VTF and drop it into that folder, materials/models/npcs/arachnophob_sphere. If you want a custom damaged eye, you need to edit personality_sphere_light_damaged.VTF... and if later you want to edit its body then you have 2 skins: personality_sphere.VTF and personality_sphere_clean.VTF
THAT should work.... for sure. So try and let us know!
Regarding your proposal, I'm glad you like my maps and I feel honoured that you want me to join your team, but I can't, I'm developing my own mod and it takes me already more time than I have, and I've already done many side projects in the way 
Thanks anyway! and good luck with your work! 
Thank you again. I figured out the workings of the hex editor (things just werent clicking in my brain telling me the obvvious.), and now in the authoring tools' model browser, I can find the correct .mdl file!
But,
dramatic music starts playing
whenever I go to open it up, I get an error that reads nothing more than: Error opening the file.
I attached the files I used (Note: When you open the file with the eye, I didn't change the texture yet, so it will appear as Wheatley normally.) I can't seem to find what I did wrong, but if it's unexplainable, or i'm just too stupid, I have backup plans.
Also, don't change the model name near the bottom. AFAICT it does nothing but crash the viewer if you change it. Only fix the one at the top.
I guess that was only a silly mistake, that's why you keep receiving the error "model doesn't exist" or "error loading de model"... instead, just change what you've got by this:
The bottom part is ok, I guess.
Take into account this other thing when hexing a model in addition to what I already warned you about: you can't use the backspace key to delete any character you wrote wrongly... check out that if you do it, all characters will move 1 position back, while when you enter a character you insert it, therefore you don't push the rest of characters 1 position forward, ok? If you need to correct anything wrong, just navigate with the arrow keys back and rewrite whatever, don't use the backspace key.
I'm real happy you were able to stick through this. Guess no Thompson eye for me then. Are you sure you can't just somehow edit a skin and not create a new one?
Again, thanks for your help! Expect an epic custom story to come soon (not really, its huge) with lots (like 2) of new characters and plot twists and all of those goodies. Again, thank you so much!
-arachnaphob
Okay...
after validation, still no luck. The model viewer says that it failed to load one or more .vmt files. Now i'm using your model and swapped the textures for the ones I need, but still no luck. It's pink and black. By the way, this is my first time working outside hammer but on the source engine, I guess you could say, so i'm kinda new to this stuff.
Oh if you need to convert the VTFs to 7.4 here is a program that does it: https://dl.dropboxusercontent.com/u/16218991/ASVTFC.exe
Arachnaphob wrote:
I've tried them, and no matter what, I get the famous black and pink missing texture. The model can actually load, though. Maybe its just time to validate again. Ill edit this post when I get the chance.
You will kill my patience >.<
If you read carefully all that I wrote, and followed my example, FOR MY HEXED MODEL you need the textures into /materials/models/npcs/arachnaphob_sphere folder:
And THOSE in the picture are the textures files you can edit, don't rename them, but use the same names because I didn't change that into the model file, ok?
Just in cases, I'm attaching them to this post, WITH the VMTs already pointing to the correct materials folder. PLEASE confirm you can see the model correctly.