This could be a cool mod for someone with monstrous fingers.
Here is my board with Alps keycaps (from an Apple AEK2 with white (cream) Alps) which fit and are ever so slightly higher (perhaps 2 mm?).
The pitch is a full inch, and with the extra height factored in, there is ample room for even a Sasquatch to enjoy the wide-open finger spaces!
Don't know what to tell you about the spacebar, it is 6" long, and the Enter is 3" and both have metal wire stabilizers.
The AEK2 will be for sale too, I have not cleaned or tested it, but I am guessing that it is OK.
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Finally, I have a BRAND NEW mod to offer this forum that has given me so much!