Where to find raw material? Sin Hong Huat Aluminium Pte Ltd 22 Defu Lane 7 Singapore 539343 Tel : 6284 2333 Get scrap aluminium sheet from them. They had various sizes and in different grade. T6061, 5052 etc Soon Ming Engrg & Hardware Blk 2 Defu Lane 10 #01-523 Singapore 539183 Tel : 6283 3338 Get aluminium block and bars from them. Also "thick" diameter alu / metal / stainless steel. They cut to length your requirement. Do check out their scrap corner. Teck Cheong Aluminium (Pte) Ltd Blk 803 King George's Ave #01-246/248/250 Singapore 200803 Tel : 6294 9650 My favourite shop for Alu daimeter rod below 10mm diameter. Almost the cheapest in town. The only sell in 16 feet length, please do not walk in and ask for 1m. They do cut to shorter length for easier transportation.