@Marcusb - I don’t know the plumbing codes where your live and if this is potable (drinkable) water or irrigation specific water source from the city. Many locations now require a back-flow prevention device (vacuum break or double check) valve between irrigation systems and a potable water supply system. So people like a master valve in the system, but there is so little pressurized lines at the manifold the manual cut-off valve should be fine.
Depending on the supply water pressure and the type of heads installed you may not need a pressure regulator. There are pressure regulating heads that can be bought if needed. Drip irrigation systems typically will have a pressure regulator on the line.
Looks good. You’re making real progress and just about there.
As @DLane mentioned, good progress.
From the looks of things, you’ve got the irritrol valves, the knob on top center is likely a flow control, meaning you should not need additional pressure regulator as each of your valves essentially has it’s own built in.
It also looks like you are designing the system without a master valve, which would go between the water source and the valves. To help prevent leaks and make your system more maintenance free, you should definitely build one in while it’s easy to do so, if your climate allows aboveground valves (which it likely does, considering you had an index system), than having a valve with backflow 2-in-1 above ground system is your best bet. Above ground allows you to quickly fix it and will keep most of the dirt out of the valve (meaning it’s less likely to develop issues). Check your local home improvement store to see what they have in stock.
