Angle Du-51 (M-13) 356x354x22mm
Srednik DS-138 188x467x28mm
Smooth-drawn molding M-13 35Hx15mm
https://dikart.ru/catalog/corners/Ugol_Du_51_M_13_356x354x22mm/ 
https://dikart.ru/catalog/arched-frame/Gladkotyanutyy_molding_M_13_35Hx15mm/ 
https://dikart.ru/catalog/the-gutters/Srednik_Ds_138_188x467x28mm/ 
Please note that the centerpiece in a large frame does not exist in catalogs this element was created specifically for the order.
polygons -124489
vertex-136 394
For large angles you can use the Turbosmooth modifier