That F104 looks great......and bright!
I've started the PCM Tempest now. I've built some of their kits before so I was prepared for a bit of a wrestle, which turns out to be just as well!
Those 21st Century Toys kits are very basic but that Zero has a more than decent interior and, as for all their sadly now discontinued kits, if you throw away all the screws etc and build it like any other model I reckon you end up with a decent model. I paid less than £10 for the Zero!
Cheers
Steve