All the allocation of resources and travelling from one mission to the next is done in every natural unobtrusive way. In fact the world map that connects the missions is identical to the Fallout map and contains the same sort of hazards. We made a decision early on not to rely on GUIs to link our missions together. I think this approach really helps to keep the player immersed. But achieving a multi-player version of Fallout has definitely been the main goal.
Single player is vitally important to sell the game.
The reason we started with the multi-player was that we knew it would be the most technically challenging thing to get right. The architecture that we developed for it underpins the whole game engine. But the single player is much more demanding in terms of design. X-com and Myth are also great inspirations for me. Anti-aliased sprites, alpha blending, dynamic lighting, multiple heights.