Sh4dow21

I just got the reflex software as I'm training for my first plane, but I can't seem to find a website (that is still up) from which I can download other extra 3d models. I already tried rc-sim.de as any forum I reach recommends that website. (I'm mostly looking for modern jets, not light aircraft, as Reflex already includes those). Also is there any way to upscale some of the already existing models - as in a 0.81m wingspan F16 to a 1.2m or something like that? Should I just get RealFlight sim instead?
Any suggestions? Thanks for the help.