I don't want to post this, the interconnect wiring in really ugly. It's temp install to prove it works, once a base is built it'll be redone.
It's wired up in 3 buses. A center bus, and each arrow.
The 555 is wired dead-bug, it powers the center bus. The top left switch is a takes the power side of the center bus, and outputs to power side of whichever arrow bus. Grounds between bus are all tied together.