I was aiming at 1200# & ended up at 1660# dry on the scale (oops!). Your frame is stout, but if you build with an eye to weight & strength, it should be possible. Where lots of us get in trouble, we think in terms of house building not trailer building. Take a look at the framing used in older trailers to see what works. I'm amazed at what has worked with 1x2's, staples, 1/8" panelling & glue. Not in a teardrop, but in full size standys which still roll along well enough. Take a look at some of the build logs to see how different people approach the weight issue & see where they ended up.
I overbuilt my cabinets, extra panels weren't necessary, 1/2" where 1/4" would have worked well, but as a former cabinetmaker, it's what I knew that worked. Should have thrown away about 1/3 of the panels, but I wanted a strong build (I got it, 20,000 miles & no problems) so I chose to err on the side of strength. There's no right or wrong here, just compromises which add up to a build in the end.