Imperial Shuttle - Making the Basic Shape

Starting off with a cylinder primitive I then stretched it out into a cuboid with rounded edges, I then duplicated this and cut away a large portion away leaving only the rounded edge with the Boolean difference tool. From this I then moved the rounded edge onto the back of the main ships base and combined the meshes and target welded the vertices into position, after this I added in some extra edges to the corner and pulled them out to create a more rounded look to them.