The Dandy Horse is a reproduction of the vintage Echo Flanger circuit, a 4 in 1 effect producing a chorus, flanger, fixed flanger filter and double track delay effect, adapted to use either two 3007 or two 3207 BBDs.
The dimensions of this pcb are mm 133mm x 100mm. This pcb is included in the ready to solder kit:
This project is by Lectric-fx.
Here is the direct link to the manual with layout and schematic: