Was able to put in a little more work today on the trailer. Turns out even booger welds can be a booger to remove lol. A little advice for anyone who is working with rusty metal and doesn't feel like going the route of angle grinding, I found that phosphoric acid works amazingly and can be had for under 20 dollars for a gallon of the stuff. It leaves an ugly finish but makes the rust inert.
In line with the budget aspect of this build, a neighbor of mine is moving out and was nice enough to give me a couple gallons of exterior paint. I figure I'll use this to cover my canvas after it has been affixed. The trouble I ran into today ended up sourcing 2" foam.There's some a ways away from me that I'll probably end up getting. Surprised that the stuff goes for ~$40 down here when I know it's closer to $25 in some states based on a bit of browsing. Might yet try to find a way to get it for cheaper, but as of now I'm stumped.
I'm also working on building a little foam cutter from an old desktop PSU that I have laying around. There are some handy guides on youtube for similar projects.
As far as design updates go, nothing major is occurring now. I have it drawn out at this point, and any real changes will be the result of problem solving once the build really starts. I'm hoping to have the trailer at least mostly assembled and painted soon.