I don't have many bright ideas, but this was one (well I think so anyway), and I forgot to post a progress pic at the time.
I wanted a 2 wire fence like I have seen at a few circuits, a metre inside the main safety fence. They are usually just 6" x 6" posts with a couple fat old wire ropes run through them.
I was poking round a discount junk shop and spotted packets of chopsticks which already had the 45 degree bevels on the ends of them.
Cut and used the top 1 /1/'4 or thereabouts, drilled two holes in each, at the level where the wire rope was to run, then painted thm rough/dirty white.
Drilled into the bottoms where I had cut them off, fitted a bit of axle into the hole, and left about 10mm protruding out the bottom, and then drilled the track base, and fitted the protruding piece of that axle into the track, VOILA, instant, secure posts.
Used steel trace from fishing line, ran both lengths of it it through each post in turn, then glued the posts in place last.
Placed grass and weeds into the gap between the 2 fences, still need some small signs about not crossing into the gap, rubbish bins etc for this area....and some litter lying around the place.....like a real track LOL