Here are all the tiny pieces you’ll need to dye fondant for, then roll out and cut. Make markings on clouds and bricks with food markers. (The pieces in this picture have been attacked by hungry children and aren’t what we’d call properly aligned.)
Clouds come in one-hump, two-hump, and three-hump. You’ll need 9, 4, and 4, respectively.
Bushes similarly come in one-hump, two-hump, and three-hump varieties. You’ll need 4, 4, and 3, respectively as well as two “half-humps.”
Hills come in size “1” and size “3,” which I named based on the marks on them. You’ll need 5 size 1 and 5 size 3.
You can either do the brick sections all as single blocks, or you can do the multi-block brick lengths as chunks. If you do, you’ll need 10 1-block segments, 3 2-block, 2 3-block, and one 8-block. You’ll also need 13 question mark blocks. Draw the question marks on with red markers. For the ground that runs along the bottom, you’ll need 65″ minus a few spots where Mario can fall through the hole.
The different type of blocks that Mario jump up like stairs can either be cut all as one or individually as squares. If individually, you’ll need 89.
Pipes are not as consistently measured in height as other things, so that’s why I recommended printing at your chosen scale to measure.
You’ll also need an assortment of Goombas, coin(s), a star, a one up mushroom, fire flower, size mushroom, and a turtle. Don’t forget the castle and the flag!