They're really loose in the current design- not sure what's going on, I'm working with Zeal to figure it out. For now, I'd strongly recommend using Cherry/Gateron switches for Round 0. (You can probably get away with Zealios on alphas if you don't mind some wobble, but placing them on the top row especially is a problem.)
I just did a bit of measuring. I used Zealios R2 62g and Gateron Browns from the current drop (Black lower housing), 5 each to be sure to have consistent values. I did not see any significant varience in measurements, maybe iss can measure out the Zealios he used to find out that they are a bit wobbly. The measurements I got were:
Outer housing top clip sides just under the plastic lip: 13,98mm +- 0,02mm; both
Outer housing plate retainer side, retainer not depressed: ~14,65mm; Gateron ~14,75mm; Zealios
Outer housing plate retainer side, retainer depressed: 13,8-13,9mm; both
PCB mount legs: 1,65mm +0,03mm -0,01mm; both
Middle stem: ~3,8mm; both
Contact leg close to middle stem: 0,8mm at housing up to 0,9mm at the top; both
Contact leg further away from middle stem:0,95mm at housing up to 1mm at the top ; both
Those values were pretty consistent across the different switches, so I am really interested in what causes the problem.