The S-II/S-IVB interstage looks a bit odd, I hope it's not definitive. I think it's because the S-IC and S-II should be larger. Are you going to make the S-II/S-IVB interstage and the S-II stage in one piece, like the real Saturn V ? And I want you to know that you're one of the best mod creator and that I love your creations (and Denny too) since the beginning!