If you want to join as soon as possible, you could always start with a simpler project just to get accepted and then work your way up to something more difficult. You could start with a costume where you can buy almost everything and don't have to build much yourself, such as an X-wing pilot or Imperial officer, or go with something like a Jedi where you might have to make a few more things yourself (like the obi, tabards and tunic) but aren't extremely complicated.
Also, that SWTOR bounty hunter armor you mentioned... I'm not sure that would with the Dark Empire. Granted I don't know a whole lot about that organization, but that armor seems to be better suited for the Mandalorian Mercs. Though I'm not sure if that would accept it because it's not really Mandalorian armor... But I don't know.