Welcome! From the Texas Golden Triangle . . all these trailers have wood floors. A Streamline has aluminum cabinetry (don't lose it) and spray-in insulation. Axle/tires/brakes are conventional leaf, etc. It probably weighs around 5500-6000, maybe less depending on what is missing. A fair number of owners still over around Houston, see Toms' Web Page
Code is your biggest problem. Adds tons of weight. We all of us see torn out "projects" for sale after frustration sets in. Don't do any tear out until everything in place.
$700 is scrap value is my understanding.
Streamlines are very, very well-built (better than A/S) so I'd take my time in cleaning and examining. Roof damage and leaks from that are the "problem" (as are plumbing breaks).
If you don't use it as a food trailer then you might make a few bucks on re-selling a cleaned up trailer (if labor is free).