@JoergS5 Thanks for helping out! You are correct on how the linkage work (point 1-4). The platform is tilted a bit, but the tilt does not change when moving (it does a tiny bit but that's because of sloop in the system, i did not have all the right fasteners at hand). I am working on a updated version that uses Capstan-Drive system. I would like to get this working first.
here's a fusion 360 link to the cad model
a360.**/42M19T2
in using 1.8degree steppers and total gearing is 51,8 (5,18:1+200:20)