Cant add positive advice.

But my "simple" saddle swap to linear slides has so far cost 300+ work hours.

Over 12 fits / fiddle to the ballnut mount, and now servo motor mount, and shear plate/z axis connection.
New limits, fiddle with servo mount size to the saddle plate to clear the motor mount, ...

None of it is very "hard" but all of it is slow and heavy (parts assy == 30 kg).