hi folks , thanks for the comments
polo stu the garage idea came about by chance..(like so many things), it was originally going to be cut rock face around the tunnel, but i ran out of polystyrene, and then got to thinking about the use of space and so the old boys lockup and the tunnels/caves were born, i'm sure you'll start finding little nooks and crannies on your big track.
rally p, yep for your savannah grass land no doubt, its hairs cut of a cheap builders brush (the type they use for pointing up rock walls i think) which has quite strawlike thin bristles, also some of the non plastic sweeping brushes look ok, then cut twice the length you need in a clump, bend it over in the middle and with a fine screwdriver dip it into a pot of glue and then wedge it into a predrilled hole, its kind of like planting clumps of hair, then when the glue is dry it might need trimming and tinting to the colour necessary
bill thanks again for the praise, the cars make it round ok because they usually tail out a bit on the downhill, compared to the cliff face tolerance(about 3mm) here theres loads, also i kind of like the idea that the wheels drive over the weeds, its a shame the old boy in his garage doesn't have more of an angry face, i'd be mad as hell!
just won my boy racer tuning car on ebay so i'll be warming up the dremmel and the hammer for its arrival on the crash scene soon! gonna be needing a diecast tow truck if anyone knows where??
bye for now sig