Here is the wall divided into the 4 sections ( 22ft wide x 6.5 ft tall) with suggestions of placements of the letters. I suggest working out how to make the word / letters read legibly on the wall then embellish with imagery around them.

Here are the dimensions for each of the 4 sections. You will need to make your design fit these proportions.
I drew one inch for one foot. To scale this to fit to paper you are working. 1. Match the corner of your page to the left corners of this image, draw a vertical line up from the length of your paper / page. Where it meet the diagonal line is the height of your design. Draw a horizontal line across from there.