We had a very similar oven for baking specialty hearth breads when I worked at the American Institute of Baking but ours came almost fully assembled so I can't be of any direct help but you might want to see if you can identify/locate one of their installers or find a bakery that has one of their ovens. Most manufacturers will share with you who has one of their ovens for you to look at, then you can ask the "40 questions" concerning how the oven was delivered and installed.
Additionally, I Googled MIWE ovens and got a number of hits, one of which provides a link to contact the manufacturer with technical questions. You might contact them saying that you have one of their ovens (be prepared to provide model and serial number) and ask them for instructions for disassembly. It appears that each deck is an independent oven in itself so I'm guessing that once you remove the outer shell you should be able to remove each deck independently for relocation. Just be sure to video the entire process and mark each part for correct reassembly.
Tom Lehmann/The Dough Doctor