Most of the nasty looking stuff will stay inside the box, so as long as it works, I don't really mind:)

I've re-designed the whole chassis using 18mm elements, went with the turned around L shape approach, but I'm not so sure about the z-axis assembly support. I'm using cross dowels as the box is going to be made from MDF and the previous approach is not such a good idea, as I'm struggling a bit with where to put the bolts and nuts. Here's the two ideas compared, the left one is the original one, using triangle support, the right one simply uses M8 cross dowels, with 80mm bolts going through the plate:



The load on the assembly is probably not going to go above 1kg, but I'm not sure how MDF takes bolts through the middle. The plate with the big hole has to be perpendicular to the rails, so I'm looking for most stiffness. Any tips / suggestions are more than welcome.

Regards,
dsc.