Found this one over on FSB. It was designed by Induction and takes elements from the GGG D-Verb, BYOC 2-Knob, and CultureJam's Box of Hall. Like those designs it uses a Belton BTDR-2 reverb brick, which can be mounted directly to the board from the solder-side. If you want a wetter sound, replace the marked resistors with the values listed in the layout below. You may be able to fit it in a 1590B, but I'd go with a 125B. Here's the thread of FSB for reference.
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