Up to now (Sep 6 2021) I reached the following:

-) disassembled an old Laptop for the display

-) tested the LCD-Displaycontroler successfully

-) bought and assembled Geoff's VT100 (V1.0) Kit and added an RS232 Adaptor ( from a Paspi-Shop ;-) )

-) sketching a variety of cases including the VT100-Kit and an Raspi