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Your Robotron MPU board is actually a Bubbles MPU.
So as near as I can tell you have:
1 - D8730 Stargate ROM board (missing 6821 PIA)
1 - D9144 Unpopulated Joust/Robotron ROM board
1 - D9144 Joust ROM board (Green ROMS)
1 - D9144 Joust ROM board (Green ROMS?)
1 - D9144 Robotron ROM board (Red stripe)
1 - R8731.Rev D MPU board
2 - R8570 MPU board (Defender only)
1 - R9663 Bubbles MPU
1 - D8784 Power supply (missing a cap & a heat sink on Q1)
2 - D8784 Power supply (with transistor heat sink)
1 - C8573 Defender IO
2 - C8783 Stargate through Bubbles IO
Which means that you have enough to put together one Stargate or Joust or Robotron and parts of a Bubbles & 2 Defenders.
Right now I don't have the cash to spare for the whole set, but let me know if you decide to break the set up. I would be interested in a couple of those pieces.
ken