Looking great so far! In this last picture, will that stick out be for the X-axis movement?

If i may ask a question about the Z-frontplate, that cutout for the Z-axis nut, how thin can the wall be in that area before one can notice any weakness?

I dont have a fog buster, but a simple mister from aliexpress, and alcohol works great for my projects. No cleanup needed afterwards, but if you need more lubrication to handle i.e. gummy alu, you gonna want something oily.