I would make 2 cubes one for alpha mapping and one for textureing the wireframe.
I would use this for alphamapping that way you can adjust the amount of detail from the center part of the cube by changing the alpha amount, without effecting the wireframe image color quality.
this for the transparent frame seperate from the alpha cube so it doesnt lose color from alpha mapping the other cube
sync on
sync rate 0
load image "cubetrans.bmp",1,1
load image "cubealpha.bmp",2,1
make object cube 1,50
make object cube 2,50
make object sphere 3,40
position object 1,0,0,0
position object 2,0,0,0
position object 3,0,0,0
texture object 1,1
texture object 2,2
set object transparency 1,1
set alpha mapping on 2,24
do
control camera using arrowkeys 0,1,1
sync
loop
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