Looks like you like Mazdas...
The Rx3 and FD are looking great.
About the FD, I´d lower the front a bit more on the FD. Are those Veilside Andrew´s? And did you use clear red or crimson red from Humbrol? It looks nice.
On the FB, an easy fix for the black lines all around should be to strip the paint CAREFULLY with a sharp blade, removing the extras to leave a straight line. Just rub like with sandpaper, but do it with love
and with very light pressure. You don´t wanna strip the white or leave scratches.