Whilst knocking around the net, I came across Greg Fryer's schematic for a 3 circuit Treble Booster. I liked the idea as I could see fitting several favoured TB circuits into one enclosure being a space saver for me. He had a Rangemaster and two of his own circuits in his. I opted for a Rangemaster, one of the Fryer TB's and Mictesters' Top Boost which is a circuit I've liked since he posted it several years ago.
I've used a single pole rotary switch for input cap selection, and a double pole rotary to switch circuit in and outs. I've also included a switch to allow direct out from the circuits, or via a volume control.
(https://i.imgur.com/WbCUVtnl.jpg)
(https://i.imgur.com/lF3XFXpl.jpg)
(https://i.imgur.com/BKtFrmNl.jpg)