There are hudreds of resin parts to convert the hasbro kit into a very close studio model. A few pieces have broken in transport but if you have ever worked with resin will understand this is an easy fix(all part of the fun). This link has some mor info on the upgrade kit.
The item "Hasbro Millennium falcon (hasbro) and upgrade" is in sale since Saturday, November 17, 2018. This item is in the category "Collectables\Science Fiction Collectables\Star Wars Collectables\Other Star Wars". The seller is "martinl2207" and is located in Sutton. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Chile.