Check out Art Andrew's DLT-19 page: Looksirdroids.com
GINO sells accurate hard plastic replica t-track. Saberfreak sells very close, found item, drawer slide t-track that has to be painted. Blastech sells self adhesive rubber track. I really hope someone does a run of the grip disc, I've been waiting years for someone with the original part to make copies - I believe the original part came from an old record player that was mined for lots of the greeblies seen in the films. A similar greeblie can be made. The metal box over the feed plate can be created reasonably easily.