'Creating a graph in Excel based on Cubic measurements on a table

i have an excel document that i am using to calculate the amount of space i can utilize in a shipping container. I have the measurements of the shipping container and a table where i will enter each box that i want to load into it (for example's sake i only put 15 lines). I want to fill the rectangles at the top which are supposed to represent the shipping container, based on the values entered in the table. does anyone know how i could go about this?

i'm not sure if i should make the rectangles bigger, or if there is a graph template that can be used



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