Plumbing and Wiring
This is how I have been doing my interior work. I got the idea from Jim Thornton in Durango, CO.  Thanks Jim ! It beats the heck out of hanging upside down from the rafters. It also allowed me to put the gear legs on early, so I can move the thing out of the way when I need to.


June 2, 2001
This is how I do it. I have a Harbor Freight chain hoist  hung from the ceiling.
Brakes
Rather than mount a single reservoir on the engine side of the firewall, and run flexible lines to each brake cylinder, I mounted a smaller reservoir on each cylinder. These reservoirs are available from Aircraft Spruce. One less hole in the firewall ain't bad, and it is a lot cleaner.
This picture is just aft of the one above. The flexible lines run from the brake cylinders to the parking brake valve mounted on the bottom of the baggage compartment bulkhead. From the valve, the lines run down through the floor, and connect to the fittings on the gear legs. Remember I am using the Grove Aircraft aluminum gear legs, with internal brake lines.
Below that, you can see the fuel selector valve on the left, and on the right I made a small box to hold charts.
I decided to mount the battery in the baggage compartment "well".

This should give a reasonable C.G. range with an O-360 and MT prop. Also, it keeps the battery out of the engine compartment.

Here it is, with the master solenoid and the voltage regulator. With regulator next to the battery, there is no need for temperature compensation.

Notice the ground wire is not connected, to avoid unpleasant surprises when I am working on the rest of the wiring.

The master switch circuit works by connecting the always hot terminal on the solenoid to one side of the coil through an in-line fuse. The other side of the coil is connected to the master switch, and the when the switch is on, connects ground. A snubber diode is connected across the coil to protect the master switch contacts.
After much thought, I decided to mount the Airflow Performance boost pump and filter in the left foot well. I thought hard about mounting them on the firewall, in the engine compartment, but concerns about vapor lock finally overruled concerns about fuel leaks in the cabin.

I plan to make a panel to separate this compartment from the rudder pedals, similar to the one on the other side.

I do like having the fuel system on the other side of the aircraft from the electrical system.
   
Here is the battery box after all the wiring is complete. Plenty of room for all the wires from the panel to engine compartment (4 cht, 4 egt, all instruments etc.) and the voltage regulator, manifold pressure sending unit, and ground busses.

This approach cleaned up the firewall quite a bit. A panel with camlocks in the baggage floor provides easy access.