My wife's niece from Germany comes to visit every spring in conjunction with a Pharma convention in Chicago. She is a private pilot and also a Lufthansa Nut! I made a JU-52 plaque for her a few years ago and decided to try something bigger. DO-X Was the largest and heaviest aircraft of the time in 1929 and could hold over 100 passengers and did fly from Europe to NY. The cabin was very luxurious to include smoking rooms, dinning room and sleep cabins. It had 12 counter facing engines. Even with 12 engines, it was considered under powered. It had a short operational life, being retired in 1937. I have included a short YouTube Link. Lots more on Wikkipedia.
Plaque is 1/8" BBPW and 1/4 PW backer painted black.