I have two problems though, I cannot seem to find a way to get the default textures for the units. Could someone point me in the right direction? (Hopefully it is not blatantly obvious

And does anyone have any suggestions on how to make the GUI adjustable, or am I going to need to make one for each resolution I can think of?
As a side note:
When I am playing, I need to press alt + f6 and alt + f9 in order to get to the assigned groups, pressing those two keys alone will not do anything. Any suggestions for that?
Any help would be appreciated!!