try this test out.
huge i made it earlier but website host was down to upload it yesterday.
i set it up the camera is just screipted to move in the +X direction as grid 'sprites' are layed down along that axis so you get a feel for the size of the level (each square in the sprite is aprox 16 quants a side)
the numbers on screen are
camera X
camera Y
camera Z
the X coordiante the last grid square sprite is layed down
number of 512x512 grids layed down from X=0 -> x > 999999
the inset view is a camera view located at the main camera view but it just rotates around as the main camera moves
of this what YOU are after is in the .wdl script:
the sky cube definition
and the sky_clip = 0; line in function main
to get your infinate space