Metal Maslow Sled easily tilting upward

The only installation using the older metal-maslow setup with the ridgid router i could find so far which seems to work is this one:

https://forums.maslowcnc.com/t/jasons-build-log-12-top-beam-30-above-hoping-to-cut-sheet-aluminum-to-custom-sizes

He did raise the linkage attachment to 10,5 inch (!!) and did set up the motors 1ft from the working area! Which makes sense because this should dramatically decrease tilting in any direction.