Back last summer, while working various things on the camper during "found moments", and while determining best ways to run systems through the cab-over step-up cabinet - which houses the fresh water tank and is my only "warm-side" hidden place for connecting the left and right sides of the camper - I decided to locate the more rigid and non-forgiving runs in an order of install, i.e. first the copper propane lines, then the 120V electrical cables and finally the 12V wires.
And I could have! I have 95% of the propane materials! I have the 120V cable! But I kind of wanted to run those, when I do, as a complete install, and that meant first getting the sheet metal up to place things like shore power inlet, water heater cover, etc.
Plus I think I wanted some visual completion and I was in a mood to do something else. Like run the roof wires (clearance/marker lights and interior ceiling lights) and insulate the roof, etc. But I needed to locate the clearance/marker lights on the new wood first to see where wire run holes would be, and that meant transferring existing holes in the metal to the camper's new wood surfaces.
So I enlisted DW, climbed the ladder and brought down the metal odds and ends. I still wondered about my re-shaping of the front cab-over wall and how its shortened height would effect my metal and exterior trim needs.
I positioned the front cab-over wall metal to the camper and clamped it in place.

You may recall, in order to effectively install and seal the new huge escape hatch I had to flatten the mounting area, and that required pulling its top arch downward, in effect shortening the height, and bulging the sides. I hadn't changed the circumference, so I was pretty confident the roof metal would still fit fine, but what about the front wall? I knew the metal would require trimming on top, but was there enough to cover the side bulges? Yes! That bulge was minimal. The holes for the original clearance lights were another matter; those were close to - or right on - the new edge. (Scratch head).
And you can see in this next photo from the back side, just how much higher (lower?).

And here's a closer view from the front.

I penciled all the openings and removed the template.

Here's an example. You see the original clearance light on the left. To its right is the original location, with screw holes and wire cut out hole.

The original wiring method daisy-chained the 12V positive lines (ground is through the sheet metal), so two line wires came into the light from a hole drilled in the 1x2 edge, folded over and stabled to the plywood surface (inside a short piece of electrical cable plastic housing cut from scrap 14 gauge 110V wiring originally used in the camper).
That installation method created a bulge at each light which prevented a nice flat surface for sealing a cab-over light. Additionally, the center light was placed directly over the vee point. These methods created water infiltration concerns right from day one. It was not the only design flaw for potential leaks. I would need alternative methods and/or higher attention to detail.
Here's another thing. When the original worker cut the front window holes with his trusty router tool (maybe the same after lunch drunk who cut that wild router path on the driver side wood - remember that?) he plopped the router bit right into the wrong spot in the metal and wood and went "whoops"! Thank goodness the boss didn't see that. Tell the window guy to use some extra caulking. Ship it out!

You can see just how close the window mounting screw holes are to the outside edge of the window. Not a lot of room for fudging left or right (and still cover the sheet metal holes on the other side by shifting it all slightly left).
Something else I found interesting was that all the clearance lights and the two front windows were "eye-balled", I mean little in the way of measurement. If you look close, the window openings are not exactly level/plumb or the same exact distance from the centerline vee. In fact, the window opening with the router oops is already 1/2" closer to the centerline than is the other unit. And when one compares my clearance lights to other TQ camper pictures, you can see that these are mounted various distances from the roof edge, depending on either the worker, the particular factory, or both.
So at this point I made quite a study of how to place the sheet metal, how to cover the holes and how to place the lights and wiring.
This meant a thourough evaluation of my exterior trim/molding metal and what sorts of exterior trim are currently available. It's rounded! That means "formable". No I don't want plastic/vinyl edge molding. Hmmmm.
Tomorrow let's look at the original trim and see just what might be usable. It seems the only commonly sold aluminum is the rigid extruded stuff. My application needs form-able, malleable, soft stuff! Annealed? And depending on location, up to 15'4" long (back wall - including camper jack corner areas - which isn't how I'm doing it - but it illustrates the product for the design). Not exactly shipped in 8' lengths!