Nice work zag0r
, will ad your idea to the next one.
Mlaen: I don't know about any web... but there goes my poor atempt to help you (ignore the spelling too)
Joint a 3D picture of the basic elements for one of those clip noses:
A square section plexiglas rod of about 5*5*35.
Two rectangular bits of plexiglas of about 5*18*38
A wine (no hole on it) or champagne cork.
Once the plexiglas is cut and smooth out, you just need to drill the square holes on the side plates. On my case I use a 4mm drill bit though both plates, and then work the pieces with a thin tapered square file. I place a piece of masking tape on the file at the point where the measures reach 5*5 to be sure my holes don't get bigger than needed.
From the cork you cut two slices of about 4mm thick, and you work a fillet on one of the sides with some fin sand paper. You then glue them on the side plates at the opposite side from the square holes with some polyurethane glue (liquid nails work OK).
Fit the rod on the holes and try the nose clip. See how much rod you really need and cut the rest +3mm. Heat up a flat screw driver and appy to the ends of the rod until you deform them a bit (rivet like effect): that will sop the sides to fell of.
You close the nose clip by applying to the nose and firmly pressing together the sides. To open it you just need to pull apart the sides at the holes/rod point.