Based on what we have seen up to this point in our Eaglemoss 1:900 scale U.S.S. Enterprise NCC-1701-D build, most of the saucer Deck Panels have designations such as ‘U3-11’ and are following a consistent pattern. Using this information and the full-size image of the starship from the introduction poster, I put together a diagram showing where I think all the panels are supposed to be fitted.
NOTE: I am not sure about panel U3-01 just yet as it is hard to tell if they will actually ship us a part that big, but it seems to be accurate:
When we start on the lower half of the saucer, I will try to get a diagram of those panels put together as well. I hope this is useful in some way!