Just had to chip in here, as both a keen modeller/vendor and long time UFO fan.

It's great to see some folks having a go at modelling this stuff. For a good long while I've had the intention to start modelling a whole collection of the most commonly featured stuff from UFO, such as the regular sets and some of the vehicles that haven't already been done.
 
I remember seeing the genuine Straker's car in the flesh, so to speak, at a show when I was a kid and I started modelling it a couple of years ago but got distracted by other things. I may well have another crack at that though, in my spare time (Curiously, I had cause to start to model a Jensen Interceptor for another project and that model- while abandoned for years again- is actually very near completion- I only mention this because there was nearly always a Jensen Interceptor in the car park in the outside shots of the Harlington Straker film studios!) 

As for the Moonbase girls, I should think that modelling the wig shouldn't be too much of a problem; it doesn't really move a whole lot so I'd imagine a smart prop would suffice.

I'll keep looking in on this thread to see what else happens with all this and I'll let you know if I manage to contribute something.