Did you know that when this Star Wars UCS Millennium Falcon was created (2007), it was the largest set ever produced by LEGO? It measures 33" long by 22" wide and 8.3" tall. With 5000 pieces and a 311 page instruction book, you have your work cut out for you!
The helicarrier from The Avengers is made to be built from LEGO bricks, and LEGO Ideas (formerly Cuusoo) user ysomt came up with a design that uses 22,694 of them. Isn’t it a thing of beauty? He reviewed stills from the film and did his best to make the helicarrier screen accurate and get the proportions just right. It measures 85.4 by 45.3 inches so you’d need to clear a big space to build and display it.