Here's my threading. It is exactly G 1/4" spec and is deep enough for even the deepest of fittings. After the threading, the plastic returns to the inner diameter of the threads, not of the fitting: this means that even the thinnest-walled fitting will not be restricted by the inlet/outlet.
I shortened up the whole thing a bit after reducing the height of the fitting housing and deciding that 4mm is probably excessively thick for the top. Now the screws are too long: the block is 18mm high and M2 only comes in 16mm or 20mm.
The distance between the centers of the fittings is 19.53. So that means the radius of an individual compression fitting would need to be ~9.75mm or less to fit. I don't think it will work. It really seems like you'd need something as wide as a Supreme to do it. Why are compression fittings getting popular?
BUT NOW I'm getting a bit discouraged. I didn't plan on getting this made when I started, but somehow the fact that it's going to be impossible isn't good. If the base can't be made I can't imagine the middle or top can't be (or can they be?). If the base is all I have to change, that'd be fine I guess.
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