[dwarvenwarrior]

We use extruded aluminum from IPS. The stuff is 28mm quad-slot. This is light weight, and very strong. The channels on the four sides allow easy attaching of components to the frame without drilling and tapping! This is also nice for fine adjusting linear-wise. It is about the same weight as angle aluminum, but far more versatile. There are many accessories available that fit in the aluminum for different jobs. We have been very happy with this supplier.