Franklin, Looking at your 3d model, you are doing good, I should suggest, however, that you make the prop nacelles a little smaller, they are looking kinda wingish.
heres a picture of a K-19 model I built still on the sprue, note the size of the nacelles, left, about the middle under the deck peice (the oval-looking peice)
another pic, look at the bottom, theres a size refrence
