tube is 6082, not the fancy 70 series stuff, but it's good enough for IZAX so it'll do me , bent using a home made JD style bender, pushed to it's limits
http://www.chopperhandbook.com/bender.htm , @Magnum, your bender will out perform mine
the aluminium extrusion goes by the name of ITEM , http://www.item24.lt/en/home/products/building-kit-systems/mb-building-kit-system.html
prob not cheap, but I managed to obtain a piece