The Siren Board

Hello (Again)! Just wondering what would be the easiest way to build a custom siren controller (What parts do I need?). I'm hoping to make a controller that will be able to do an automatic attack signal so I don't have to stand there manually sounding it because my fingers hurt after a while of holding down buttons. Any help or tips on building something somewhat close to an AR timer would be greatly appreciated! Thanks!

For automatic attack, the way I've seen it on most timers is a rotating cam with a switch on it. as the cam rotates, a switch that's fixed in place will be depressed by the cam starting up the siren. when the cam completes one rotation, there's a drop and the switch gets deactivated while the surface of the cam rises again to meet and activate the switch.. All you'll really need is a 3D printer, some switches, a motor to run the cam, and some skill with a CAD program. (Bonus: Greensand/Petrobond, scrap aluminium and a furnace).
The cam should somewhat like this:

For alert, of course, you'll just need a switch

If you're comfortable enough to do so, or can enlist the help of someone who is, you can make an attack cycle with these relays and make whatever timings your heart desires. You will also need 8 pin bases and a push button to engage the relays.