General: Getting Rid of PSU's...

I think this is a little simple to get the best from the 317 CeeBee, have a look HERE I think something like this would be more stable as it uses a potential divider to adjust the regulator and it uses a fairly large capacitor across the in rails. The output voltage calculations should be easily in your grasp.

I think this is a great idea, so long as the PSU doesn't kick up. I cant see why it should though.
There are all sorts of goodies on this site, I hope it helps.

The fun is in making your own Spode, unless you can't be bothered, or don't have the time. Rolling your own gizmo's is so much more satisfying.

True, but at least it's your own wheel.

It's a good thing we're all different, it makes for a more interesting life. Making my own allows me to change it's function, output voltage or what have you. When building audio equipment a great deal of creativity is needed, even with the PSU's.

I've tweaked electronic devices to my needs many times, this gives you exactly what you want, a better built and a more reliable end result, but as I said, we're all different. I still enjoy the challenge. Like hey, I have a good quality car charger for my phone. It's made and designed by the phone manufacturer and looking inside it is well made and well within spec. The only car charger I could get for my HI-MD player was awful. It was a good job I checked it before use, otherwise it may have damaged the player. A few mods and that's it, a decent charger that is well in spec and should be far more reliable.
So re inventing the wheel can be very advantageous.

You got one for a pound? I want!