Nice try, but it can be much better.
Look at that kamaz master example - it have similar softwheels but I've double it for consistent looks (and make vehicle realistic size/weight).
Now it's time to try softwheels that can stand high rpm!
In my point of view - you fail. Need to make accurate cut and board bouncing effects. It's very very basic, nothing to play yet. Ball even can't do a loop. Look an phunbox1, there are many pinballs better than that. 6/10.
You should start over with a board carcass first.
Cool but you pick a hard way to do it =)
Besides - light not correctly calculated from "sun" - It depends on car angle.
Try to use k-probe on wheel - than you can do realistic shading like in my sphinx.
9/10