Most major cities have a 'plastic' store that makes about everything imaginable PLUS a lot of cheap scraps. I used ABS plastic about 6"X15" (@$3), a light strip of aluminum flat bar 1/2"X3/16"X36" (from any major hardware store for about $5), some 3M auto (emblem) molding tape, 2 decent (nickel sized) magnets and 3/8"wide X 1/8"thick weather strip. Tools: hacksaw and file; 1/8" drill bit and pop (blind) rivets, pair of pliers (or vice), and a heat gun. The last 3 items are really only needed if you are also making a visor for your MFI. (REMEMBER DURING THE DAY, THE SUN WILL MAKE SEEING INSTRUMENTS HARDER AND EVENTUALLY CAUSE FADING.) I even made a small visor for my GPS.
I have other pictures of the visors for the dash, MFI, GPS, and the 12 feet of brake lights I added since having my '08 Gen 2 destroyed (rear ended) last year. Some of the latter are about 2 feet higher than the roof so people who have to drive lifted trucks, etc. can see them too.