Yesterday, I finished my MBSEQ V4 build. I decided on the following components for my version of the sequencer.
STM32F4CORE
MBSEQ CS: Wilba Control Surface
BLM16x4: 16 x 4 button matrix
TPD: Track Position Display
2 x MIDI I/O: MIDI interface, a total of 4 MIDI IN and 4 MIDI OUT
DOUTX4: 4 x 8 digital outputs
AOUT_NG: 8 CV outputs (1V/oct)
I did think about placing the digital outs and CV out modules outside of the main sequencer using line drivers so the sequencer did not have to be near the modular synthesizer. I did test the configuration and it