Make the idea, flesh out the idea. Code the basics, flesh out the basics. Work on the segments of the basics in turn making it modular in the process for easy updating.
As everyone has said future updates should be kept till v1.0 is out there then do upgrades/updates.
I had the same problem with Hunted the thing that miffed me in Hunted was all the models/levels that were required to do what I wanted now im going for a segmented level with prefab approach so I can make levels VERY fast in a editor then whack in some prefabs to make the whole thing fit what I want to do. Yeah I have to design the levels/models but its easier than using something like Quill3d to do it, I am making an exporter so I can export them as b3d's then import into Quill3d and lightmap em :)
As everyone has said future updates should be kept till v1.0 is out there then do upgrades/updates.
I had the same problem with Hunted the thing that miffed me in Hunted was all the models/levels that were required to do what I wanted now im going for a segmented level with prefab approach so I can make levels VERY fast in a editor then whack in some prefabs to make the whole thing fit what I want to do. Yeah I have to design the levels/models but its easier than using something like Quill3d to do it, I am making an exporter so I can export them as b3d's then import into Quill3d and lightmap em :)