I don't know how you could draw this perhaps begin with the pyramid in elevation.
1. Work out a volume for the pyramid and use 755.7 feet for the side and 480.7 feet for the height. Volume of pyramid = 91,506,450.981 cubic feet.
2. Divide by 8000 = Volume of Kings chamber 11438.306 cubic feet.
3. Divide by 275 = Volume of inside of coffer 41.59 cubic feet
Note re numbers 8 and 275 25/8 Babylon value for pi and 864/275 Fibonaccis value for pi.
Volume of inside of coffer =1/2,200,000 volume of pyramid and therefore the volume of the inside of the coffer represents average size building block as it is said there are 2,200,000 average size blocks in pyramid.
I don't say these numbers are absolutely correct but it is worth tinkering with. 69.12 feet/2 = 34.56 x 12 = 41.472 inches compare NUMBER with volume of coffer.