Lets gooo!! Doing the hard stuff up front! Laying that core foundation. Looks flexible enough to grow as needed too. And... sounds like a ton of work!!! But you are no stranger to that either! ;D I am (atm avoiding) upgrading my servers of 10+ years old this past several weeks with no clear end in site... I am redoing a lot of choices I lived with for those 10+ years (like how did the data layer get so accessed in the web layer classes... ug... well I know why... moving to fast and not following the design! I am eager to see how your project progresses.