Began installing the conduit (1/2" PVC irrigation pipe, Sched 200 I think). Using TerminalTown's CTM-HM mount (http://www.terminaltown.com/Pages/Page65.html). But first I had to get a heater--got a cheapo propane tank-top heater from Ace Hardware and Aviation Supply, takes the chill off the garage air.
Temporary clamp to align
A final install, though plastic tie will be replaced with aircraft quality