Warning: this instructable involves wiring mains electricity and a hot light bulb, it can be a shock or fire hazard. If you have no experience with this, seek help of someone who does.
Step 1: Bring in the power cord
- add extra tube around the wire
- use insulated wires as shown in picture, don't confuse with speaker wire that has only one layer of insulation and should never be used to carry mains voltages
On hindsight, drilling in the corner between two glass panels would have been better.