Hi Alan, First of all for converting VGA to cat5 lots of companies do boxes for that. Kramer do the TP-121 for the sender and the TP122 for the receiver. Look at their web site for information. They say it will run 100m, but I have run it longer than this in the past. You can get very cheap senders and receivers, but you get what you pay for, maybe also look at Extron. If you need simple switching from VGA to video, use the Kramer VP-740. This has DVI inputs and outputs, you can also attach composite video, S-Video, VGA and do a seamless switch between them. Obviously run the output of this through the CAT5 converter. I'm sure if you can get a DVI-CAT5 box, don't know who from, or you use the Kramer VP720DS switcher which has VGA input and output. For a 40' wide image you would get an image height of 22'.5 (16:9). You say the throw is 55 ft, so you would need a 1.375:1 lens which is quite wide but you can get 0.8:1 lenses. As the last post says, you will need a large projector for this, over 10,000 lumens. Again the Sanyo do the best price range, you would get away with the Sanyo XF45, 10,000 lumen with a 1.35-1.75 Short throw zoom lens. You would need to check your dimensions though because for a 40' wide image with this lens you would need between 54' to 40' from the front of the lens and it is best to give yourself margin in this. If the budget is there then I would recommend a 12-20K projector, but you should be able to get a Sanyo dealer to bring a demo projector and lens to see what the XF-45 will be like. I believe some of the Christie and Barco projectors have built in warping capability, but they are 3 time the price of Sanyo. The bend in the screen is going to be an issue. In the middle the throw will be longer so the image will be larger, this will give an oval effect to the image. You need a curved screen controller (warping unit) like a Silicon Optix IA-100BEX warping & edge blending unit. This will only need to be set up once, but you will need someone who knows what they are doing. There are other manufactures of these (like Barco) but they cost a fortune compared to this one. Please note this reply is based on a budget system, if you want high definition results you will need a serious budget, and get an expert in !!

Has anyone stacked 2 Sanyo XF45 projectors using the fixed wide lens 1:0.8 lense? I have stacked the Sony Fx51 with 1:0.9 lense with much playing around and it worked well, although I had to have the lens almost touching to be able to crosshatch! Any hints? Tips? Suggestions?