I always say "Don't use left handed joysticks, don't build a 4 player cabinet and if you do the for god's sake make sure it has 4 buttons per player".
Here is where I ignore all that and build up a 4 player cabinet with 3 buttons per player on lefty joysticks.
Of course there are 22 other cabinets in the room with this one, so no one is stuck playing on it full time.
It was a working Hangtime conversion. I was originally going to just polish it up as Hangtime, but once I got into it I found out it had a whole bunch of problems (wired by a lunatic with no isolation transformer, had a bad rom on the board, a lot of the controls didn't work, etc). So I opted to try to bring it to something closer to what it originally was.
Gauntlet boards and wiring are pretty expensive, so I am going to go the mame route, went with Wicos over Atari logo sticks for the same reason. For simplicities sake I kept the original lefty gauntlet layout with 3 buttons that was already installed. Changing it to a 4 player right handed layout would require re-fabricating the entire control panel and it would be tough to get a diamond shaped button layout within the bounds of the existing player control areas.
Coin doors have been restored, but they aren't going back on until I repaint the front. I have a new front graphic as well.
Right now Merlin has the wrong color buttons for the scheme I decided on and the Valkyrie has the wrong color joystick handle.