I have clear about art concept in GUi and the music theme.
the soundtrack I want is one mix 0 AD style with original AOE style ( yeah those midi files)
with the GUI can be nice have a theme style art or concept based in the culture or geography. Like mostly of classic RTS.
I like nostalgia factor, plus mixing with the new concepts.
AoE (I) gold edition was my first love.( in the RTS genre).