You know I may sound like a hostess pie here but I need to point this out. Are we ASSUMING that we can get said twinkie to near light speed or beyond without the acceleration making the twinkie into a fruit pie on the ships bulkhead? If you are speaking about a gradual acceleration to light speed (or some point there of) than we need to consider what is happening to the twinkie and the outside world during this acceleration period. Then we can consider what happens when reaching the optimal cruising speed.
Yes they [Princeton and a school in Italy] have managed to accelerat “energy packets” to what is effectively beyond light speed. Follow the link, you will need to search around some but only because there is so much info. You still can't move something solid that fast.
http://pupgg.princeton.edu/www/jh/re...e_theory.htmlx