Do you think that's practical to do something similar? i mean, taking picture, modelling etc ?
No I don't think its practical at all. It sounds to me like its a whole lot of work, that can be easily avoided when using for instance 3DMax or Lightwave.
However, those tools are expensive, so that kinda narrows it down pretty quick.

On another note, I've taken the time to download the game, and I must say it plays quite well actually. Too bad there's no AI yet