Very Nice... well done!!
On the heater.... haven't done one myself, and not sure what kind of heater you have (sounds like just uses engine coolant routed through heater like mine), but the 455 I just acquired with a heater in the cab is done as follows:
Note: you'll likely have to drain/collect coolant for duration until connections replaced.
1) Heater was installed in desired location (front center roof of cab, above and in front of driver)
2) 2 hoses with both a shut -off valve and a connector nipple (double male) on each
3) Engine coolant out/in lines replaced with longer hose which reaches around front outside of hood at frame height.
4) Line from 3 above has same nipple setup in center without shut-off valves.
5) To connect heater, disconnect center of hose in 3 above and connect each end to heater hose ends in 2 above.
6) Open shut-off valves in 2 above and use heater.
Note: when heater not required, disconnect from heater and re-connect in front of hood at frame, use tie-wraps to secure in place and away from moving parts or potential crush areas.
The only concern I have with this setup, and perhaps why quick/connects were not used, is that the joint inside the cab (about half-way up the corner post with tie-wraps hold in place) are in the perfect place to get your face with super hot liquid should the joint ever fail. Perhaps not a serious concern though.
I haven't actually made the "heated" connection yet but that's how it is setup. I might just connect it tomorrow, getting a tad cold here these days.
Let me know if you'd like a few pics. Also, pics of wiring setup if needed - the wiring was half-a55ed so I just redid the clips, plan to add a toggle bar for heater, beacon and signal lights soon.
Hope it helps, good luck!
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