I am sure its all been done before……… but this thing sounds nice and is very easy to build. The distortion characteristic is very smooth.
Check Out Schematic Here
Demo with the Clipper, at about 1/2 drive and a little delay from my “Improved PT2399 Delay”, noodling on a Meat Puppets Tune:
Circuit Salad 
Nice simple Overdrive circuit, will try it later. For other mosfet clippers look for OCD, Zen drive and Fulldrive mosfet schematics. As you say it has been tried before. Nice sound clip.
Cheers
Kevin