For smaller displays or where it can be made in sections, the 25 x 25mm extrusion used for 3D printers is easily available and pretty handy for building stuff. Random seller https://www.ebay.com/itm//272967697202 -- Jerry Durand, Durand Interstellar, Inc. www.DurandInterstellar.com tel: +1 408 356-3886 @DurandInterstel