Actually, if I remember correctly, to be accepted as a TD in the 501st you need to have a pauldron and ammo pouches. That's pretty much it. It's a requirement of the MEPD to have a backpack, correct ab plate, sniper plate, and most of all, be dirty. I know a couple people who have been granted an TD designation without many of the things listed above, most notibly the lack of dirt.
But you might want to check with your GML on that one.