"Most Challenging Piece?" from a comment on Derek's chair thread

Derek has been documenting his Dining room carver chairs in the thread below.  It's been fascinating to see the work progress. At the end of one Derek's late posts in the thread he asks Ellis and essentially all of us what has been our most challenging piece to build? I encourage everyone to dig through that thread to see Ellis's reply featuring a fabulous chair he designed in the 70's.  I am re-starting Derek's question re: "What has been your most challenging piece to build?" 
(Note: I have links to two pieces on my webpage in this post-when you click on the links you'll be taken straight to my page and must hit your browser "back button to get back to this post- I suggest right clicking the links and follow the open in new tab option)
 
I had to dig through my own portfolio and give it some thought. For me certainly that 80 inch Diameter Table I made a year ago is right there simply for the size of the entire project. But when I broke everything down to steps it became a long series of "do able" steps. So I think that Table project is probably no 2 on my list. For now I'm listing this Cherry Cabinet with  Stained Glass .   

My reasons for complexity:
1. This had to fit in a space with some quite spectacular furnishings, and feel "at home"
2. I had to build this piece without the stained glass panel available to build around. I am in Michigan and the clients are in Washington D.C.  There where dozens of phone calls/ and emails with the clients-I enjoyed working with them very much! But keeping track of all the details was a challenge even though the final piece was much less complicated over all than other pieces I've done or certainly other pieces they had in the same space. 
3. As far as making the door that held the stained glass panel-The panel set inside a rabbet on the inside of the door. But the panel was not square so I had to make the frame with enough "slop"  that I could place cherry shims in where needed when I arrived on sight. This also meant thinking of as many shapes as could bee needed and bringing as many tools as necessary to make the panel fit as well as apply any finish on sight. I did not take any pictures of the "fitting process" as I as too busy making the needed alterations. As I recall part of the process included rigging up a long straight edge to rout a taper on the door rabbet on sight that I had made nice and square back in my shop.  All turned out well in the end but I was sweating bullets in the processes.
4. One last memory- well there were actually many memories -including getting to see much of DC including the National Archives where my client worked, and getting to visit collage friends who had been living in DC for some time.,---but my wife and I made the trip in one long drive- we were schedule to arrive in time for dinner with the clients-spend the night at their home then set up and install the cabinet the next morning----in spite of cell phones and geo tracking I still managed to get us behind schedule for arriving in time for the dinner he had prepared. By the time we arrived it was probably two hours after schedule and I felt enormously awkward like I had made a pretty bad "1st impression".. Dinner was great though as was conversation between two couples that had nothing previously in common other than discussions about a cabinet design!