4 hrs. on the firewall.

Cutting out the soundproofing from the holes that need to be open.

M5 rivnuts were supposed to go here (2 holes in middle), but they're oversized (which I failed to notice...), so the rivnut spins... :-(.  I'll drill a couple of new holes just below those.

Putting in lots of rivnuts!  You can see here the 4 for the battery holder and down below are the 6 for the fuel pump cover.

Battery holder test fit.

4 holes drilled and M4 rivnuts inserted for the Garmin GPS bracket.

Test fit.  I need to drill a hole for the GPS coax to pass through.

4 more on the other side (symmetrically placed).

My initial thought was to put the 914 TCU on the cabin side of the firewall at the same location it would have been on the engine side, but I'm concerned about access once the top front skin is riveted here.  The only access to install and service will be from below which could be very difficult.  Any thoughts?

On the right is the cabin heat control, which I need to assemble.  On the lower left is the bracket for the fuel pump.  The manual says these are connected to the firewall with M5 rivnuts, but is that really necessary?  The holes there are smaller than M4 and M5's are a royal pain to pull...  Thoughts?