So I pulled all the carpeting and found a local marine carpet guy who would do the entire job at a better price than my time allowed me to do (I saved some cash by pulling it myself). Iof course I found a spongy aluminum floor and learned that this isn't unusual, so I cut marine plywood, covered it in fiberglass resin, and added aluminum edging on the bottom rail plus added stick-on foam to keep it quiet and that brought the height right to the normal floor level. Here are some pictures of that repair and the replacement carpeting installed:
1996 Prostar 190, LT1
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