The only time I've ever been in first class was on an MD-11. I do remember taking my kid to an airshow at an Air Force base where we did a tour of a KC-10 and my 3 year old kid got to be at the controls along with a photo with a pilot (who might have been younger than the plane). What was really odd was someone else touring the plane who claimed to be a flight attendant. She looked at the coffee maker and said it was the same as the kind she used on MD-11s and DC-10s.
I recall the Amfleet cafe's as having the exact same Grimes coffee makers as you'd see in most airliner galley's...not sure what they use nowadays....
As for KC-10's...I had a friend who retired flying them for the USAF, and then scored a job with UAL as a DC-10 simulator instructor at the old Stapleton Field in Denver. For years I teased him about taking me for a "flight" in one. Finally, just before he retired from UAL, he took me in after hours, and told me he could not operate the full motion, as it was too costly, but did let me do one IFR take off and landing from 35 Left, and back on 26 Left....
Let me tell you...even though it was just a simulator, and he talked me thru the whole 'flight'...I was sweating profusely like it was the real thing.....