Can't comment on the cms but the design looks like a bit of a "mint"
Mint copy but not quite as polished. I have to admit my install if mint (which is the first version) looks almost identical in colour sheme including the coloured rows to your tables but the new version has changed.
I would also say I can see what you are doing with the highlight type bars but the darker area is supposed to be on the bottom half of the bar and it looks un-natural for it to be the otherway roun d and it draws the eye because of that.
I would also add more vertical padding to your main menu as I think it looks a bit too thin and fiddly. Other than that if you geta release going would be interesting to have a look round me old mucker!
Just saying that with it being a cms if you want anyone not to bag it then making it look like one of the most popular stat tracking packages by one of the worlds most popular designers probably isn't a great idea.