This little kit from England is a fun science-fair type modern kit to show the results of mechanical scanning.
http://www.mindsetsonline.co.uk/prod...oducts_id=1376
It is all plastic with a PC board with all the modern components and LED for backlight on the window. It has an EPROM image on-board but you can connect a CD player and download other images to play from the CD.
It will get you close for a start until a Baird Televisor shows up at the Goodwill. Peter Yanczer used to have a complete camera/receiver kit with modern components and the cabinets (you assemble) but not sure if he still sells them.