I used the female end of a section of DT track to make the 6" incline section... With the leftovers I made a box to retain the multi density foam stop-blocks, I cut a slot in the $1.67 - 4" x 4" electrical box and trimmed away the outer DT track section... The remaining DT "tab" will slide on top of the box's remaining bottom surface... It is elastic powered so the foam compresses and the whole box slides back 1/2" on impact, separate foam blocks for each lane to come... The leftover section I used had the hot wheels connectors trimmed from the DT section ... top ;
The stock $1.67 electrical box ;
The Sloppy Stoppa box ;
The track and box, position before impact ;
The Sloppy Stoppa unit, extended after impact ;
The elastic will mount over a screw, jam-nut, washer and nut run through the raised center strip and between the foam blocks....