Thanks so much, ed! I made it, but my problem is biggest.
I need not oval as in the red but curved half-circle as in the blue. When I add some edges "Subdiv" not work, message "Unsupported poligon type"
And other problem, when I use bridges, loft, extrude "Show pts" is not work((( I would like moved points before make "Subdiv".



Thanx OSTexo, great work. pls upload 3dm file.