Electra, what an awesome idea!
And the "let's be fair" comment and continue smashing the first one in "4-year-old" mode, was funny, as was the whole video
Thank you!
Maybe just "half press" each Lego brick? Tight enough to hold and not losing too many bits on the way, but loose enough to have the tendency to deconstruct fantastically..?
I'd recommend heavier pull weights, exact offset impact, maybe with a guiding rail solution and maybe inserting weighted inlets (lead) into the car, to increase mass (maybe only with heavier pull weights)?
Love to see more!
All the best
Martin