Sorry, norma. I had to rush things as a storm is bearing down. I got some, though. I'll tell you where I measured. I can measure anything else after the storms pass tonight.
The opening of the frame where the pizza goes in and out is 17-inches. This is about 2-inches down, where the edges go straight instead of tapered in. In your 3rd pic, it's right above the round turn-table.
See the handles in the main unit in your first picture. I measured going straight across like you did, but at the front screw, back screw and middle. Mine were 19-3/4 inches (front), 22-1/4 middle and 20-1/4 at the back screw.
On the dome, upside down as you did, straight across is 22-1/2 inches. (the frame was 22-1/4, so it slides over.)
The brackets that are tack welded into the dome on the inside of the dome is where I measured next, but at the edge of the steel like you did. Both of the distances going straight across at the brackets from weld spot to weld spot are 20-1/2 inches. Assuming yours are at the same spots as mine are, they should be equal. The spot in the dome where it lines up with those weld spots should be equal to each other, too. I think these two sets of measurements would be the best ones to make a judgement with.
Front to back like the last picture you did was 18-3/4 inches.
Let me know if you want more or different measurements. After the rain, of course. Don't wanna soak my nice fire-bricks.

Roy