I did the only thing to do and contacted renovateyourworld.com for the information needed. The wood I am cutting is 4"X6". I am cutting it 5/8" thick per instructions.
The next part I received today, 5/12/98, from Mel at the above.
"the grout for the cobblewood flooring is composed of sawdust from the wood mixed with a fast-drying oil-based sealer in a ratio of two parts sawdust to one part sealer. Pour the grout on the floor, push it into the cracks using a rubber trowel or your hands. Trowel in the grout. Squeegee off the excess. Steel wool the face to remove any remaining excess grout that could dry to the top of the bricks. Let dry over night and then apply another coat of oil-based sealer the next day."