This is awesome. I have been looking for a scan doubler since I bought my A1200 in 2006 and this one goes beyond by dreams.
The idea to use an FPGA is brilliant. Would it be possible to add chunky pixel screen modes in the future, by using the same technique as used by the Graffiti from Individual Computers (
http://www.amiga-hardware.com/showhardware.cgi?HARDID=498)?