Brunetti Mercury Box

Here is a layout for the Brunetti Mercury (should fit in a 1590B size box).
Frank_NH has uploaded another verified, slightly modded version in the Forum section a while back.

This is the best video I could find (in Thai language):

Start biasing JFETs at 9V.

Madbean Sharkfin (Maestro FSH-1 Filter, Sample & Hold)

Here is Brian's modified version of the old Maestro FSH-1.
You could buy his PCB here and find all infos about this project here.

THAT Jam Compressor

Here is a DIY project similar to the Carl Martin Compressor Limiter.
There are 2 layouts: a large one that works at 9V and a smaller one where you need to decide a way to feed +/- 12V to the circuit (just a charge pump with regulators wouldn't work with this circuit).
You should read the original threads from FSB here and here before building this effect.
Good luck!

Menatone Pig

Here is the Menatone Pig overdrive.
There are two layouts: one with trimpots to help bias the JFets (would start at 9V) and one with fixed resistors (probably need to test different values to bias the JFets properly).
I've also added a charge pump (it works at 18V).
You can find the original thread from FSB here.

John Hollis - Easy Vibe (with mods)

Here is a layout for John Hollis Easy Vibe.
I've added Mark Hammer's anti-ticking mod and Piotr Zapart's LFO mods.
Try 5K/20M LDRs.