Hi Dick, the trees are coated in a plaster, pva and water mix applied with a brush in two coats, the first thicker than the second. The brush application helps offer a bark like effect, and i figure pva will add flexibility or some other magic to the plaster matrix. Truthfully i saw it on YouTube and went with it. I could have sanded the tree smooth for a less grainy texture, of course gum trees being what they are you have a good range of options. The foliage parts are seafoam dipped in diluted pva followed by a dunk into some foam foliage that went through a coffee grinder.
I've had my static grass applicator for a few years, ever since Ember showed her work off. It's good enough but it's the best cheapest one i could find. I've also acted as the earth a couple of times with it, which converts it into an involutary swearing and jumping device ⚡⚡

. I'll find it and take a pic shortly.
I managed to save a few bits Phil, and had to let a few bits go too. I would have liked to keep the vineyard but there was no way it would survive the move, a couple of the buildings are now entombed as well, including one that had the terracota roof tiles attache one by one. I couldn't see it working/fitting on this layout so it will gather dust for the foreseable future.
John the Plafit chassis are great, i make 1/24 hard bodies for them and have a ball. They are comparatively complex compared to most slot cars and that's part of the fun. My builds (which i really should share pics of) tend to cost betwen $160-$300 which for 1/24 isn't too silly.
I competed in the 2019 Plafit Nationals as Beastm's co driver, before then i had very little contact with them, i now have quite a few.
One issue has been people to race against. People are often scared to use my cars as they're 'too pretty' so i need to remind them that they're all doomed and i built them to race. My one friend that is willing to build them has bad luck with damage and gets frustrated that i can get an aesthetically pleasing car together in a week or so which doesn't explode on impact.