This is a DIY project and it is meant to be built following the Youtube video and the complete 3D assembly, all the missing measurements can be done there (even I used it during the build for the video). Every component is in there too so when in doubt check it out.
I tried to be as thorough as possible on the video and the 3D model but I cannot guarantee that you can exactly duplicate my results.
Please be safe, I assume you have some basic safety training and skills to carry out this project. Your tools and workshop will be different from mine so consider these files as a guide only.
Link to the original Fusion 360 project.
STL files for every component.
Readme file with a few tips and tricks.
All the original project source files exported from Fusion360 apart from the sources of the motor change modification.
PLEASE NOTE: YOU WILL NEED A MINIMUM BED SIZE OF 250mm x 200mm
In the last modification I added the STLs for the motor and belt change modification and a steps/mm calculator for the belts and rods.