Hello again Trenck.
It's still too early to tell the requirement.
According to the information given in September the minimum configuration is:
Processor 1 GHz,
Graphic card 64 Mb.
RAM ?
But you will not be able to lower the camera angle to ground level.
This config will run fine for sure:
Processor 2,5 GHz,
Graphic card 256 Mb.
RAM 512
All this may have changed though since this is old information.
/Lars L.