The DeArmond Square Wave – it’s pretty much an MXR Distortion + with a couple of minor values changed. It does come in a cooler-looking box…
There’s a great analysis of the Distortion Plus on Electrosmash, which will apply equally to the DeArmond Square Wave.
DEARMOND SQUARE WAVE – VERO LAYOUT
MODS
The most obvious place to start – swap the germanium diodes for silicon.
Brian Wampler provides a list of mods here on Premier Guitar from back in the day (2008). Some can be done on this layout, while others would need a completely new layout.