i'm not 100% sure that's correct, the way i understood the concept for the park now known as epcot (from a show from '06 talking about disney world) was this:
walt and the imagineer team were working on two projects at once; one showcasing different countries of the world, while the other focused on future technologies and other things like that.
they had built scale models of what both were to look like, when two of the imagineers took the two models and pushed them together, creating what is now known as epcot.
although, i'm not sure if the models were built with walt still living, the imagineers did take all of his ideas, except walt's idea for spaceship earth, which was that skyscraper looking thing posted above by goodyellowkorn.
please correct me where i'm wrong, i'm trying to use some information i've only heard twice, and the last time i heard it was like 6 months ago.