This is our build log of our converted X1 mill spanning several years. Minor upgrades every few months when we have the time. When we first started we didn't know anything about metalworking/cnc and info was hard to come by.
We originally made our stepper motor mounts out of plywood. This worked "good enough" to mill out the final version of the motor mounts from aluminum. Alot of mistakes were made but at the end we now have a cnc mill that works pretty decent.
Take a look and you might see something that may help you convert your X1.