I have always felt that the AMT Dynamic modular frame sections were the best ever in past or present. The hinge, 3 front axle mounts, as well as cutable tongue and the myrid motor mounts, allowed many to go farther in assembling and racing. At the tim, even the body mts were viable, though lacking in style today. I imagine these frames are still popular in vintage racing. I have been picking up a few lately to assemble historicals. An STP Turbine and a mid-west T/A and maybe a stocker.