Nikita,
You may draw everything and then:
0) Download and install the free scripts from the website below;
1) Create a circle with W = H = 0.08" and a fine stroke;
2) Deselect everything and with the Direct Selection Tool ShiftClick all Anchor Points where the inner curve is sharper than the circle made in 1) to have them all selected together;
3) ShiftClickDrag over the circle from one to have that selected as well and run the Round Any Corner script.