hi martin, i will (hopefully) try to explain..
the alloy bord, plastic sheets are all off cuts from a freindly sign maker surplyer
the alloy bord, is a sheet off 2mm rubberished black plastic? sandwiched between 1mm alluimiom, it what sigh makers use front signs, i think.. its strong, light, and easy to cut with a jig saw..the plastic sheets as far as i know, again, off cuts, are uva foam bord, its very light, easy to cut, craft knife, and easy to score lines into.. as for the arches, its was /is done by useing a master template, i made.. out off the foam bord, the arches are a medium pan lid diamiter, i set it out, drew it in in pencil,, so that the end section off walling on each sheet off plastic, added up to a mid section ..so when u jioned two sheets up, the arches carreid on with the same spaceing.. took me the best part off a day to get it right, but worth the effort, now, as it all looks uniformed.. as for the cinnima, i hadnt planed on one.. the school ,well, thats a differnt story
trade name for the alloy sheet is
Probond,matt,aluminium composite panel,international iso9001 standard cerififed
trade name for the foam bord is
Palfoam tm low weight foamed pvc sheet...www.palram.com
hope thishelps,
mike