IIRC from someone else's labours, it's possible to jack them down using plasticard for slightly more depth, along with a workable, tough, filler like Milliput for shaping the aerodynamic fairings that hug the Phoenix radomes.   Always liked the chunky AIM-54 missiles: the Phoenix was the apex of the Hughes Falcon evolution, along with the highly successful AGM-65 Maverick missile (which the Tomcat never used).    Tony