Guess I could have used my eyes and searched that forum thread further. 
Thanks for posting those mini-tuts, they’re quite useful for everyone.
So I take it is also from a newer build? Since it looks like whatever hits that walls travels right through quite easily.
It looks as though I’ve got this thing pretty much set up correctly, just I’ll have to wait for 4.8 for the fix.
Now that you’ve made the offer of asking questions, the flood gates are open 
Questions/issues:
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Frequently, when the car runs over/into the destructible or it’s pieces, the game with “freeze” for up to 0.5 seconds and then continue. I say “freeze” because the editor isn’t actually frozen - particle effects continue, and debris will move.
Sounds maybe like this has something to do with the engine calculating the collision, but that would be surprising since my PC specs are pretty high (3570k, GTX 970, 16GB DDR3)
Have you ever experienced this? -
Also frequently when running into/over pieces of destructible or any physics object, the vehicle will fly into the air as if jettisoned. It’s like the two can’t exist in the same place at the same time so they nuke each other.
This may be getting out of the destruction realm and isn’t your area of expertise, but I’ve noticed that regardless, the vehicle (ours, the track test one, the example one, whatever) will fly into the air much more than it should when it hits a bump or piece of geometry. Even with gravity jacked up, things that enter the air seem to float, or bounce far too much.
For the record, restitution on surfaces are all set to 0 -
What about the damage spread issue I mentioned, is that waiting for a fix with 4.8 as well?
Side note about a potential bug: When selecting chunks in the DM editor, I can’t actually select anything unless I go in real close to the chunks in the viewport. Then I use left-click to select the first one - no need for CTRL