It will look great!!!
Same solution:
"color" : "0.6,0.6,.0.6,0.3",
The three first values are for red, green, blue multiplier.
The transitions won't look the same. Is a diferent case:
- Chapala have only 3 layers.
- This one have more layers and rotated, to minimize seams.
- This rotation will cause different shading also. There are two triangles on each square and is the way the engine calculates shading.
If you are ok whit seams, try to leav the dummy instead (3 layers), and change the values on the dummy .mtl.