I needed a size in between the 'BIG' (70mm) and 'MID' (35mm), and I was unable to import the .skp file into Fusion360...so I had to :

• import/export the STLs into Tinkercad
• load them up into OpenSCAD
• chop off the bottom the 'BIG' boxes
• chop off the tops of the 'MID' boxes
• merge the two halves together

They should be around 52mm high now (as pictured)

30/9/2021 edit : After printing a bunch of these, I noticed that there's actually a lip at the front which is an overhang and I was having difficulty printing these in PETG, I've trimmed these off and added 3 'NOLIP_' stls