Anyone ever built one? Thinking of 'trying' to build one as I have quite a lot of timber and the Mrs wants one (too tight to buy one + they cost a lot) Whats the best glass substitute, don't fancy polythene as it is noisy if it's windy and it doesn't last. The wood I have is chestnut so offers good rot resistance and is about 5" square and 5 footish long. I assume I should build a concrete base and build off that. Thanks.
5" square is fine for the base and frame, but far too thick for struts/mullions.
Personally, I think you should buy a second hand one from ebay, build a base to suit and simply buy any replacement glass needed and you'll save yourself some much time and hassle....and probably expense.
Use corrugate plastic sheets or you can get plastic sheets that if you look at from the end on have little squares running through the length and are used in conservatory roofs etc, both can be had from b&q