Brief Description: Reinstall Cabin Frame / mate with motor mount
Reinstalled cabin frame. Centered on firewall; marked and clamped into position.
Placed motor mount in place and clamped. Measured both cabin frame and mount to figure out placement of AN4 bolts that hold both together thru the firewall.
Secured everything and pilot-drilled to #40. Incrementally up-drilled to 1/4" for AN4 HW. Used bolts to hold in position.
Back-drilled thru firewall into motor mount mounting pads using #20 drill. Started to up-drill, then realized I needed to install the cockpit-side steel mount reinforcements. Disassembled so I could close the garage door. It was over 100 deg at this point, noon.