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Yes it is the light grey cornice but was going make so that the edge of spoiler ??? Would be 6-8 inches from rear body work. have seen a few towed caravans with a bigger version of cornice. lots of modern motorhomes and 50 seater coaches have a large spoiler intergrated with their roof's. angle of mine would be slightly down to copy start of boat tail. boat would not be fesiable due to length and large over hang on an already overloaded chassis. bottom line is that astra+addition in photo is suppose to be wind tunnel tested. so thought i would copy a proven idea. none of us can afford a wind tunnel for testing ideas. now i need a car and driver to follow and film tuffs for airflow + a still day in the windest part of europe. nothing is ever easy but if i get a good result then all hard work pays off. sure most ecomodders on here have had alot of trial and error before getting reasults sort which makes it an emormus sucess. still researching ideas to clean up underbody which is a nightmare to try and clean up as need access to stablizer legs water tank draining etc etc. may just got with full length body skirt
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