First thing you need is a garden.
 Preferably tidied.
 Square tubing for the frame which I found on a website that produces modular furniture units.
 A good saw.
 A mitre to cut the piping at right angles.
 The best bit about this modular system is that it comes with a handy joining units.
 Just bang the appropriate T L or + joins together and job done.
 Measure up your screen. I used a photographic backdrop sheet, 200 weave, doesn’t let any light through which gives a better picture.
 Eyelet punch.
 Every foot is fine but reinforce the corners as this is where the most stress will be when strung.
 A way to attach the screen to the frame. These are those coathook things that you hang on the back of doors.
 The first iteration I used bungie ties.
 But I found I had greater control of the tension of each part of the screen by using tiedowns
 String it up
 Other points to consider. You obviously need a projector. If you can’t place the projector exactly front and centre of the screen you get an effect called tombstoning which skews the picture. There are projectors that can correct this digitally but the picture quality suffers. The best ones do this through the lens. The one I have (Epson) has a massive amount of give, up to 50% left/right and 100% up/down. So I point the projector out the bedroom window on the first floor and swing the image over until it’s centred with the screen.
 Sound. This took ages to get right. First I tried domestic wiring, phono plugs etc, but over 10m you get lots of noise on the line, completely unusable so don’t waste your money. Go for XLR cables which are balanced. Then you just need the right connectors, for your system, Amazon is your friend here. I played out from a DVD player with phono out for sound, to 6mm headphone jacks with the other end to XLR to the pre-amped monitor speakers. The only thing that I have still to figure out is a remote volume control system.
 Update:  Have replaced tie-downs with a single long piece of Bungie cord threaded through the screen in a zig-zag fashion. The tie-downs were good but it took in excess of half an hour to put up or take-down. With the bungie cord it can be done in less than 10mins.   Also, a note to home owners. If you build anything in your garden over 2m on a boundary fence expect to get a letter from the council. I solved this by making it a temp structure and just put it up when needed, hence the reason for swapping to the bungie cord for rigging.
 The first film I showed on the screen was Ghostbusters and it was epic.
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