Bench Power Supply Project
Your main problem will be the overwhelming noise. Those things are loud. Loud noise means you're not going to want to use it, and that's a crappy bench supply.

Other than that, it's certainly a decent project, although I would start slow and forget about an adjustable 1-30V and a negative voltage. Increasing the voltage or making it negative is a whole different project involving step-up and inverting switch regulators, none of which you want to handle right now as a beginner.

Whatever you do, make sure you can use another power source, so you can hook it up to something less loud, maybe a second hand laptop supply.