Chapter 8: Head Rest, Heat Duct, Seat Belts
I didn't start building the head rests until I'd moved to the hangar. I didn't want these components in the way of moving around the vehicle with the canopy off, and they are not needed to do anything else in my design.
You will see pictures of how I did mine at this link...
The portion of the heat duct that's between the front and back seats was built as part of the base structure. I extended the heat duct around the nose wheel well to the feet (see picture in Step 8 portion of this link), and also set up the heat duct with a gate valve at the firewall, following Andrew Anunson's method. I've not yet connected the hot air to the gate valve behind the firewall, or the gate valve to the console heat duct yet, and probably won't until after Phase I testing, since I don't need it yet. But all the infrastructure is there when ready.
I bought seat belts from Aircraft Spruce per the ACS recommendations. They are fine but I didn't install them until after I moved to hangar. I'd recommend not even buying them until you get ready at the airport. They just sat in storage for several years at my house and tied up that $. Plus I got smarter along the way and might have chosen a different seat belt by the time I actually needed them.