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Hi wrecksmoondee. Looks like you have just about everything you'll need. Maybe some exponential VCAs (unless I overlooked those) and additional attenuverters, though the matrix mixer may work for inverting signals. Will you be adding any external effects?Also curious if you are only interested in Doepfer, or will you be researching other manufacturers too? As much as I really want that A154/A155 combo, but there are very capable sequencers in a much smaller footprint.
You are off to a great start here, though I wouldn't recommend buying everything at once. If you just buy a few modules at a time, that will give you the opportunity to adjust your plans on the fly to incorporate modules that may be a better fit for the type of music you want to do.
Have fun and good luck!