Welcome Simon! Great to have you joining us! I hope those WNW kits get built, they deserve to! Your question regarding undercoats is quite valid, I used Tamiya acrylics for many years with no undercoats, but always undercoated a white finish with a light grey, interestingly enough, as the white on it's own needed too many layers to cover the plastic colour completely - just my experience! But enjoy your modelling with us, there is always more than one technique to accomplish a fine finish, and we are all learning! Regards, Marc.