I cannot think of any that come to mind quickly. I really want to see mixed-form factor cases also. My sense is you could get a 3.5" to 2x 2.5" converter.
On the slim DVD also, that may be asking for a bit since you would need two side-by-side 3.5" bays and I am guessing three 2.5" bays below and a slim DVD above the 2.5" drives. Best option is probably using converters for the 2.5" drives then getting away with IPMI 2.0 for the BMC's remote image mounting if possible.