The Meteor project is for the original SD-9, but features one of the two mods from the SD-9M, the ?Mids? switch. (The second SD-9M mod, the gain switch, is not backwards-compatible with this circuit.) The second switch on this PCB allows you to switch between different sets of clipping diodes.
The dimensions of this pcb are 49,5mm x 49,5mm. It is also available as ready to solder kit:
This project is by Aion Electronics. Since the modifications featured in this project require some basic knowledge, this project is rather for more experienced builders.
Here is the direct link to the manual with layout and schematic:
Here you can find build reports on this project: Build Reports