That's..um, yeah, kinda out of control, but in all the right ways. As for "glaring omissions", I don't see any, especially with the outboard complement you've listed. The big question I would have regards the physical setup, making sure the right module sets are in the right places so that you can get maximum functionality across the entire rig. That issue, though...you're going to have to figure that one out, and configure this for your own optimal workflow.
BTW, if you dig the 909 sounds, you know you're gonna need the other electro-ish Roland analog ones. Check Delptronics' LDB-2e and 2x to drop some TR-606/CR-78 tastiness in there with 'em.