Good points guys; thanks for the suggestions too. It helps me think about improvement now rather than waiting. There are so many things involved as you know that you kind of subconsciously start prioritizing and some decisions aren't well thought out.
I do believe now is the time to research and upgrade. I am not particularly interested in period correct during modification/upgrade changes. There are certain characteristics we're trying to retain (like the refer chimney unique to Travel Queens) but the vent grill isn't one of them. :)
I just checked over my TT hood (with fan/light etc.) and it's a Hengs brand. Same width, while taller and deeper, but would fit fine. The important aspect is the vent in the wall. It's huge! Comparatively speaking. Almost 6" wider and up to 2" taller, which would make my "larger than necessary" repair board be a perfect choice! And that would resolve any questionable siding issues around the hole.
I started doing some internet searches for this sort of product. Found lots of parts, but few "whole units". I found a ductless, but I'm pretty sure that means no outside venting and I need (and want) the exterior venting. Any ideas for a product? A number of options to choose from would be advantageous. Any others who have an idea here please speak up.
By the way ticki and AnEv, yes it does appear to be the original provided, based on the two campers and others I've seen. Good points about the water infiltration. But the same louvers are used on lower fridge vent doors - wonder how wet that gets in there?
Here's a picture of how they fit together..
