Hi Vincent,
As to the DCE scanmagic, the socket with the chips
does go on top of Lisa. The second socket goes
on top of the Alice chip. The ends of the cable
connecting the two boards should face each other
(the main cable to the 15 pin (from Lisa) will point straight toward the back of the machine).
If your display turns out funny, it's likely that
one of the sockets isn't seated all of the way;
or that the socket for Alice isn't lined up
correctly (I did both wrong at first

).
##### - Connecter for VGA
Lisa
##### - Connecter to ALICE socket
Gayle
##### - Connector from LISA socket
Alice
(basically, the glue blobs should face each other)