The default window set isn't that bad if you turn off the frames and such, at least for the MainHUD items that you keep up at all times.
As for the see-thru-ness, just lower the window opacity in game (both of these things are don't thru context-menus in game, not by editing the xml).
That aside, what exactly are you looking for? 'Simple' is pretty vague -- perhaps break out M$ paint and whip up a mockup of what you're looking for?
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