Atomic you may be right and in that case I would be very disheartened. I am not saying every ht can do this just a select few (mostly dense packed with favourable characteristics). I am sure you know a lot more about hts as you have had one, I remembered you saying that you were going back for a second to improve density. Nevertheless having seen the results of spex, biscuit, shuffle, NicNitro in full sunlight I had the impression which the pictures certainly give that on inspection from the top or in overhead lighting it will not be see through. I would be elated to hear from people like Danny Noonan, evolution, BadhairUK and bushy whose photos also suggest this may not be an issue for them.