Upon closer inspection, it looks to be between 1/16 to 1/32 of an inch less than 1 3/4". But yes, it's pretty much what I'd stated before. I measured from the thickest point, which on the Mk VII is where the door hinges with the main body.
Take a look at pics of any screen-used Mk VII, and you'll see that the door doesn't sit flush with the main body. It can't, if the door is to be the correct thickness to match up with the bottom end of the main body when open. I can post a pic to help clarify if needed.
Mike would be the one to know -- his prop company (HMS Studios) are the ones who made the screen-used originals I myself have always thought that's what was used, and is what I used on my scratch-build.