Looking pretty good now in my opinion. Again, if you are intent on lots of aluminium with a really good finish and short job times then the raised X-axis designs are really the way to go (i.e. not this layout).

However, with this design as it stands you should be able to cut wood, plastic, and the occasional aluminium without any problems. I'd say it fulfills your brief and will make a nice machine.

I'll just make this comment, which you can take or leave! The extrusion pieces between the gantry sides, rails, and lower plate - I can see why you've done it like that and it will help alot with the corner stiffness. But they look a little unfinished, if that sort of thing bothers you, then one of your first cnc jobs could be to cut out some 6-10mm aluminium plates to go over the ends and tidy it up a bit. The rear end cover plate could easily be larger and join all the gantry, side and lower plates together. In your link the rear view is shown in the 5th picture.

Good luck with the build and post back as you go.