In fact , it asks lot of time and patience if you want to make something good.
But i agree, some others engine i think have paid some guys/team to make for them some reasonnable quality models/levels/textures for their demo.

The best would be to find the more people we could find in the community that have some good experience and to give to each just one task.

For example :
Scripters 1 : camera
scripter 2 : some particle effects
scripter 3 : fading in/out visibility of 3D models depending on distance of view.
asset modeler 1 : a house
asset modeler 2 : another house
character modeler 1 : 1 NPC character , next gen with talk and iddle animation
vegetation modler/texturer : some 3 trees
vegetation modler/texturer 2 : some 3 plants
etc ..
etc ..

This way i think we could create all necessary 3D models , and have all scripts , shaders to make a good demo.

You should post a vote to the community , to see how many people is interested ? (to see if it is really necessary or not)