The best option if you want to do vectormame is to buy a complete and working Space Duel, Black Widow, or Gravitar. The black and white monitors won't make you happy, and Star Wars and Tempest cost too much money.
Although the PROBLEM with the whole vectorMame idea is that there is no ideal set of controls.
We have.
Buttons, Asteroids, AD, Space War/s, Space Duel, Gravitar, Rip Off, Star Castle, Armor Attack, Barrier, Demon, Eliminator, Solar Quest, Space Fury, Sundance, WoTW
Dual joy 8-way. Black Widow, Starhawk, maybe others,
Analog joys (assorted types) Red Baron, Star Wars, Empire, Lunar Lander, Tailgunner 1 and 2,
Spinner - Boxing Bugs, Tempest, Cosmic Chasm, Speed Freak (sort of), Major Havok, Omega Race, Star Trek, Tac/Scan, Zektor,
Trackball - Quantum
You would pretty much have to go with a Space Duel + spinner layout, which would unfortunately keep you from playing some really great games.