The NCE is a fan update to the official Necromunda rules with three main aims. To better balance the weapons and skills alongside minor tweaks to improve general gameplay. To clarify ambiguities and patch up rule holes. And finally to introduce select new equipment and scenarios that conform with the spirit of the game and add variety.
All changes to the official rules are marked in red.
You can follow development of the project and post suggestions in the NCE discussion thread. Previous discussion here.