Here’s a few shots of my current build. The wiring is much more cleaned up right now though I have to rethink my X axis bearings before I can continue.
Are you looking to cut just wood, or soft metals too?
This machine was designed mostly with wood in mind. However I see that some simple aluminum machining could be done. Mostly in the realm of hole patterns, as I cant get the spindle slow enough or move the axises fast enough to cut aluminum without buggering up the bit. Also the spindle is not difficult to remove as i am also planning on adding a 3d printing head to it. There was also plans to engrave some custom circuit boards once things are up and moving a bit more smoothly. A large portion of the concept was also to be a stepping stone machine opening up the door to make large more complex machines. i have an interest in making a machine based in Epoxy Granite 
and this machine will help to make molds for casting… O_o some people call me Crazy… its ok though I’ve got dreams.
I don’t see any bracing between your two main rails, or any support for the rails.
Also, that’s a heck of a large turning moment on your z-axis. Aren’t you worried about flex/stability, or is it a lot more solid than it looks?
(Not meant as a dig, my current build is my first, and I followed someone else’s plans)
Yes there is need of bracing between the two main rails. There is a small amount of play on the gantry where the slide is mounted and it does need taken up however for the gauge of work I plan to be doing I and comfortable with the moments on each axis. Could the be better and built more ridged? Yes. I am less concerned though as this machine is going to be mostly wood cutting where tight tolerances are not needed or it will be doing pattern work laying out holes in a given location to help with fabricating larger machines. This has always for me been about building a larger machine and machines of a different style. This however was the entry point in my eyes. It contained the fewest parts and made use of the frame for rigidity and motion.
I do appreciate the comments though as I tend to suffer from “too close to the picture” syndrome . more eyes and questions are always welcome. As a final note, Many of my decisions were driven by cost as i have a young family with small kids and not very much spare cash so this has been a long road with many compromises to simply arrive where it is today.