TFE hit a major milestone recently - as of build 0.02.001-107-g5977a8a, available on the downloads page, all enemies have been integrated and Dark Forces is playable from beginning to end using The Force Engine.
Currently, support for higher resolutions and widescreen is being re-added, since that was previously removed due to refactoring and changes due to integrating the reverse-engineered code. Once complete, I will make an official Core Game Loop build - which will complete that milestone. This should be finished sometime this week, with the build being released early next week.
The next milestone, with work starting next week, will cover Cutscenes, In-Game UI, and Mission Briefings. While the current build allows you to play through the game, you will need to look up key card images online on two levels, because you cannot bring up the PDA. The next big milestone will fix that. I will post more information about that once work begins.