it depends on how accurate you want it to be, and how long you are willing to wait to find the parts and on runs.. im trying to be as screen accurate as i can, so finding the "correct" parts is what is slowing me down. iv been working on this project for over a year now and im about 40% but i have another 20% on order that has taken almost a year to get here... sometimes you can buy full sets (usually being parted out) in the cargo hold area, (sometimes if its been painted it will cost more) I found my TK was much easier than Boba, just for the simple reason that you can buy a kit with all the parts and assemble it. no paint or anything... and if you are familiar with your garrison near your house you can have an armor party to have people help you put it together. My advice, get antiquated with the people in you're garrison if you arnt already, go on a troop or two as a "handler", if Boba is what you have your heart set on, start collecting the parts and if you need help putting them together call someone to help you. by the way, Boba is one of the more expensive costume characters. good luck to you.
-Jimmy