Thanks again, so could still use the c20 as hud generator with a 5"~7" max projected dimension on the combiner (if it does not work i cam use it to watch movies on the go, so money are not wasted but i buy 1 instead of 4), my XGA native projector set up to 80" 16/9 to compensate the lack of the side ones is a viable solution in the meantime while i decides beweeen multi monitor (3x 24 inch is the max that i can afford) and single/ multi projector (i'm evaluating possibilities here)?
I saw the link for the HUD that you sent me (actually i already knew it, it was what inspired me to build the thing).