Gmod Menu

Im looking to overhaul my pc completely and that means all my game menus too. Most are easy to do but I am having trouble with gmod. I want to change the colour and font type of the start up menue (not the background or adding sound, that I have done). This is not the “q” menu, this is the start up menu, the one that says “Single player” “Load Game” etc. I can do all the work once i get it into a program such as paint.net or photoshop but its the finding of it I am struggling with. Where are the files located, does it need to be done with lua, how is that possible?

On a side note, whilst someone is finding those files, can they also direct me to teh blue loading bar file cause that too need to go.

Thanks