Really good idea, will need to be different colours to red and green for me as i, and many others, are colour blind to those colours.
Colour blindness of red/green is present in approx. 8% of the male population so having a target that excludes 8% of shooters is probably not the best thing to be doing.
AA S200 .177
AA S400 Carbine
AA S400 MPR FT
AA S200 .22
a bit of a theme emerging here......