This is a currency note from the Bank of the United States and is not an obligation of the United States government. The Treasury Department did not issue notes intended for circulation as currency until 1862.
The grommet panel must be a minimum of 70 inches wide, between the side hem seams, to provide just slightly more than 1.5 times fullness on the 40-inch space.
Much depends on the flatness of the floor (substrate), if the floor is flat and smooth narrow grout joints can be used. The recommended grout joint for ceramic floor tiles is 3mm. If the tiles are irregular in size the joint width can be increased to 6, 8 or even 12mm.