3.5u low profile space bar, cherry compatible (Kinesis Freestyle Pro)

Low profile space bar with the MX stem (linked in remix), but with the stem walls thinned out to not get stuck in the switch/stab frames. The 3.5u dimension is strange but Kinesis uses it on their split boards.

The first version (spacebar_35u_kinesispro.stl, 20250409*.jpg) rides at the same typing height as the regular (black) Kinesis Freestyle Pro caps.

The second version (spacebar_35u_kinesis_pro_v2.stl) has shorter stem mounts bringing it closer to proper low profile. IMG_12*.jpg shows it sitting next to Keychron low profile (grey) keys.

Third version (spacebar_35u_kinesis_pro_v2.stl) has a better curve top, thanks to https://www.thingiverse.com/thing:2783650 . Still set the stem mounts manually, as I couldn't get the generated ones to fit.