The Z4 in the picture is not mine, but I did make my own version /d/3773-bmw-z4m-e86-08
As for the E31 8-serie, that is a WIP made by me and the R33 is an old mod Harrison15 is making an R33 too but thats not it, and you'll have to wait for it to get finished.
Oh, and if you go to modzona and search BMW E31 you will find a crappy mod of the same model.