Hey guy's, I thought that I would share my first arch construction with you. I already had a heap of dumb RGB LED's that a friend had brought back from China for me, after a lot of head scratching and YouTube I decided to use 40 x 25mm rectangular PVC cable duct as the arch with a couple of aluminium angles as a base. I figured that if I glued the cover on the cable duct after it was bent that it should pretty much hold its shape. I started by making a former, I bolted a flat bar to my router and cut a semi circle out of 9mm MDF, to this I attached a flat bar around the radius with a few blocks of wood for support / clamping positions. The cable duct was clamped on one end and gently pulled around the former and clamped in place, I then gently heated it to relieve some of the stresses and then glued along the lid join with plastic glue. Next day I bolted the angles on and un-clamped it. I made three like this.