Didn't take it that way at all, and I know what you mean, it's hard to know what to measure. Are you a regular visitor, I only ask as it might be easer to divide it up into parts and maybe do some drawings or something.
Some overall dimensions would be a good start too. Length, hight and depth of the main box. Distance of the shelves from each other. Sizes of the doors too.
By all means take as many pictures as you can, they are always a help.
I really appreciate all your help Thanks