I bolted on the exhaust pipes for good:
I put high-temp anti-seize paste on the studs, and torqued the nuts to 120 in-lbs. I also used the included blow-proof gaskets between the pipe flanges and the cylinder heads.
I painted some more anti-seize on the exhaust slip joints before sliding them together. I also dribbled some mouse milk into the exhaust's ball joints.
Look at this little guy. If there was ever a mouse that was more eager to help build an airplane, I don't think I want to know about it.
I taped some plastic caps over the pipe ends to keep critters out.
I used stainless steel clamps to attach a couple of heat shields to the pipes where they come close to the throttle cable. This plus the firesleeve should protect the cable from radiant heat.
Since I had a spare, I also put a heat shield at the top of cylinder #4's exhaust pipe, near where the mixture cables goes by. There's more clearance here than where the throttle cable is, but I figure a little extra heat protection can't hurt.
This is how I safety-wired the hose clamps:
