Guys, yes he might make a great Vader. But for some reason he wants to be a Fett Head. Can you blame him? All I can say is proportion, proportion, proportion! Who cares how tall or short a person is. As long as it looks to be in proportion.
Here is what I would do. First, choose your path: Boba, Jango, or a variation. If you know that you want to do a Boba or Jango, get a reference CD or DVD. Then search for the CAD drawing that Wizard of Flight has done. Then start with one part and go from there. You might start with the chest armor. Print out the size that looks to be good for you. Tape it together and see how it looks on you. If it needs to be smaller or larger increase or decrease the size. There is no one size fits all. Then do that with each part. For example, on my Jango knees, I made 10 print outs to find the size that worked for me.
For parts like the jet pack, gauntlets and helmet, you will need to ask, who has the largest whatever and ask people to PM you. I think right now, the person who make the largest gauntlet is MOW for both Boba and Jango.
Hope that got you going in the right direction.
Asok