Here's a layout for the
Runoffgroove UBE Screamer. I have built this so it should be considered verified, but let me know if you encounter any problems. The "Mix" was suggested in the ROG write-up and is basically a 250K pot in series with a 100K resistor. I found that it really didn't make much difference in the sound so I shorted it (leaving the 100K resistor for Rx in the ROG schematic).
The effect sounds nice but is a little hissy at max gain. Have fun and let us know if you discover any cool mods.
(Edit - yes, yes there are lots of standing resistors and diodes! I personally don't mind that, but if someone wants to redo the layout with fewer, you are welcome to give it go
)