It definitely looks like an aluminum underside in the second photo from your link.
If you have a personal photo showing it even better, yes it would be nice if you posted it here, thanks
It seems like Aerges used the light grey paint, so in real life I guess it might have been more like e.g. the MiG-21 as seen here:
Thanks - it was the underside I was interested in, and as you point out, these things can be hard to spot due to camera settings etc.