I'm glad you've started this thread, I thought about it but felt I was spamming a little.

For the build container I'm thinking a science lab beaker, they have straight sides and a very small curve at the bottom.
Anything for the salt water container.

As for the build area, it will be nice to know the projection degrees on the peachy, after all that will give you both the heigh to build width ratio.

I'm looking to use the same sort of thing as used in the videos for the build base, maybe something with a tighter mess, but not too much more.

Still unsure how I'm going to project it from UV light and build the peach support, maybe some orange plastic film around an cheap wooden frame.