So, I ended up making a support from a scrapped aluminum heat sink.
Weight with wheels and bearings : 35g
Several holding points are available on the mini; I used the bumper holes for this first version. The fact that it is flexible should provide some damping and hopefully prevent things from breaking on the first crash…

lol, I will see soon enough! Maybe I should order a wing mount right away…
Up close :
I like the look with the Monster tires (double width) :
Available tire options... :
hmm ... Landing, flipping or breaking?
I can't wait to try it out & I hope it does the job... If not, the 2nd version will be better.
Folks, keep on truck'in!