Good modelling Zhukov, I'll try to answer some of your questions. About vertex limits ... I think the only limit comes from the amount of ram you have, but you got to know that vertex objects often take much more ram than spline ones . I guess that it is because only the coordinates of the points that define your spline are stored in the memory, while with vertex objects, all the points have coordinates ( is that clear ? If it is for you, then explain me ! ;) ) You can count the number of polygons in an object with the "counter" function in the "edit" menu ( assemble room ) You can do some boolean operations with spline objects in the assemble room but it will convert the object into vertex . Depending on what you got to do, you'd better use the compound method Hoborg was talking about . I hope that helps you . Good learning ! litst