Just breafly:
VD1 - zener diod for 9 volts, 0.3W.
VD2 - diod simple rectifire like 1N606, 1N5218, 1N1705, 1N4001.
Internal diameter of L1 is 6 mm. Input tap 1,5 turn from input side; coil is slightly stretched out, i.e. make some distance between turns.
L2 - choke 100uH 0.3W
Tp1 - Core diameter is 10 mm, wire diameter 0,23 mm.; double wire glue
together; Tp1 must be glue to housing via isolator base.