I don't think the 501st is as strick as everyone says. Look at the pic they let me in with ( left pic) This was taken at then end of C3 and as you can see it wasn't that good. After 3 days of wearing it alot of things broke or had fallen off. I have also seen coustumes far worse than this one in the members section... some of these might have been removed since I last checked though.
This is what my armour looks like today ( right pic)and I am still a 501st member. This is a 100% improvement but it is still not screen acurate , but to me thats ok. I have a hogepodge of parts and the only time a get "you have ROTJ gauntlets and cape and ESB this and that" is from a select few of the members of the 501st. The public only sees Boba Fett and to me that is what really counts. So, what im really saying is if you like ROTJ gauntlets and JP and like ESB everything else then do it. I dont think the 501st has become so anal in the past year that you wont get in if you do this( might want to check just to make sure though:confused )BTW I do have a JP on in these pics its just hidden behind my helm.