Ok here it is with 4 holes… Believe it or not, this is smaller than the Gadgeteer button!!! Gadgeteer button spacing was 15x15 where this one is 15x10.
Not sure if BigBang is a main board, but the button module could mimic this. Rather than have an entire controller for a single button, the module could have the ability to hook up 8 buttons.
Yes it surely can. I know I keep feeling guilty about placing a 32bit micro on a single button but the chip costs less than a Gadgeteer cable!!
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But the question remains: why big bang?
Maybe derived from “bit bang” ? Software I2C by toggling 2 GPIO for clock and data ?
Maybe derived from “big bang” as an initial state or the initial module from where everything else expands aka. the I2C master 
Second answer was very close
Ok - so the “DUE DAT” mainboard 
?
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Which chip are you using?
I may need to dust off my very dusty Eagle skills.
STM32C but we use altium now.
Here it is completed and routed, pending final review and samples.
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Interesting that one of the mounting hole is connected to VCC and the other to GND and the other to whatever net R (J1_4) and T (J3_4) are. Is that for alligator clips like the FEZ bit ?
You surely have great attention to details. Those are uart pins for backup firmware update. Not meant for daily use!
Note to self: No brass or welded-stud standoffs combined with aluminum back plates. Live mounting holes?
Correct, this is the only down side. But like you said, you need both, metal standoffs on a metal plate. The pads are clearly marked so no one would forget.
@mcalsyn you pushed the design back the drawing board, thanks for the extra work!!
@mcalsyn happy now?
We have found a better way. We lost a pin to make you happy but you are worth it
Yes, in fact, yes, I am 
As always, your attention to community feedback is top notch.
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Here are a few samples to get a feel of sizes. Most modules are smaller than gadgeteer counterpart! These are for feedback only, we are still cooking!
Button
Joystick
Buzzer
Accel
OLED
Stepper
Smart LED (addressable LED controller)
Light sensor
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Very nice !
U and D mean Up and Down ? (chain of I2c sensor as qwiic or stemma I imagine ?)
But what is H socket ? Powersupply ? USB connector ?