Here are examples of our built up letters, face illuminated signs, halo illuminated letters and logos. Scroll through the images to see the different kinds of sign construction and effects created by the various techniques involved. ICE Signs Ltd manufacture built up metal letters from aluminium and stainless steel. built up aluminium letters, logos and designs are made in our factory in Leeds, West yorkshire. Stainless steel built up letters can be in either a brushed matt finish or in a mirror polished finish. Aluminium built up letters can be powder coated to a RAL reference.