I think the big issue would be finding paper that's translucent enough. Jeppesen uses thin paper (VERY thin...). En-route IFR charts (high or low altitude) sound cool as they are white paper, blue and black print, with a smattering of green and brown. Problem is they're printed on both sides, and the inside page (flip side) will show through. I don't think it'll work unless I'm missing something. Still, a cool idea!
Ed, just do a colour photocopy of the side of the chart you want, that way it will be white on the backside - then wrap the copy around the shade..
