Why not use the original tails lites? or maybe get a set of replace LED lite assemblies you can play with and still have the originals to put back in? I don't think it would be hard to put some extra bulbs and dividers into the lamp asemblies. I imagine you are going to use the tailgate portion as well? What are you using for a micro controller?

Hey I just realized you are CanBus guy, what happened with that??

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)