See page 3 for tube length and width. For an eight or ten inch telescope, one sheet will be plenty. Get at least a dozen. Nails Assorted sizes. Hot-dipped galvanized box nails work well.
Shingles break easily, so it s a good idea to keep a few extra shingles on hand.
Old belt leather works fine. Three pieces will be used for the lower Rocker Box bearings and four for the Cradle Board bearings. The back of a cardboard breakfast ceral box works nicely.