Doable, yes... easy for a newbie, not likely. Just the swivel for the front wheels can be a problem, much less the doors for the dump. For a lot of dumpable materials, the center bottom dump would cause problems for the rear wheels to have to run over, but they have good use for what they are designed for.
Unless you need the complexity, I would stick with a more traditional dump trailer.
David from jax
If you tend to pick up new hobbies and run with them with ease, then you probably can do this. I have a friend in south Florida that bought a mill, then a lathe, and now a CNC Mill and has been making parts almost right after she got them. She has never had any machining classes, just does a lot of reading. Due to time restaints, and brain power, I don't pick up fabrication quite as easy as some, but still manage to build a piece or two when I have time.