If you look around, a lot of pedal sites describe the FL5 as a cutdown FL9. Strangely, no one seems to have a clean schematic for the FL9 or any schematic at all for the FL5.
Working off of the blurry FL9 schematic and an FL5 board, I drew up my own.
For the most part, everything is the same including component values. The nice matched transistors that drive the MN3102 clock have been replaced with regular, discreet transistors. "R11" and "T3" seems to be overlooked and just aren't present. The bypass circuit is a little different, but is best replaced with true bypass anyway. The biggest difference is the missing "Delay Time" pot from the FL9. I've added this back in as a daughterboard.
For simplicity's sake, I've chosen to leave out the 1/4" jacks, 9V clip and LED. Here's the result.
Eagle files are on my GitHub.