I, myself, sell computer generated charts. I have looked at other sellers who sell similar charts.
The golden rule really, I think, is - if the design is large, expect the chart to arrive in several A4 sheets - which you then have to piece together. The seller should have given you a guide on how the sheets fit together - I do - because I don;t just assume everyone who buys from me is an experienced stitcher.
I find that if you try and condense a big design into lesser amount of pages, you lose alot of the detail and the finished product won't look like it is supposed to
At the end of the day - if you choose a big design with intricate detail - you don't mind several sheets and you are expecting a big -ish project.