In order to have a little more interaction with the terminal, I used provisions that had been planned in the terminal by the designers.

• adding a piezo speaker, the designers have made provision for a piezo speaker in the terminal. There is room for some resistors, a transistor and a piezo speaker
• adding an LED, there is also room for an LED and an optional transistor.

These modifications are described on my github in the hack directory

Concerning the BASIC language, there is already support for note generation and BASIC gives access to the I/O with the PIN statement. You can easily make your BASIC programs blink and beep as you wish. 

The LED is located on the top side so it can be seen from the front face and its legs are folded back in order to connect to the pads on the components side

The front face is drilled but the hole does not open on the front face. The black coating of the film that makes the front face is scratch from the inside so the LED can be viewed. By doing so you don't have to perfectly align the LED position with the front hole.

I have also added an extension connector in order to have access to some signals

The left part of the top row is compliant with the FTDI download cable pinout.