UK:
case :
http://www.allmetalparts.co.uk/156-19-5u-stackable-rack-cabinet-300mm- 5055726200574.html
Rails :
http://www.allmetalparts.co.uk/181-19-5u-black-mounting-rails-m4-black -screws-and-washers-5055726202936.html
Back:
http://www.allmetalparts.co.uk/flat-blank-anodised-panels-/454-5u-blac k-aluminium-blanking-panel-5055726205395.html
USA: https://www.hammfg.com/dci/products/accessories/rmc?referer=798
Keyboard stand:
http://www.jaspers-alu.de/shop/show_product.php?cPath=84_88&products_id=268