Hello Schutzenegger !
Your dad have great music tastes !

Here is the second pattern I made (the first one was 450 x 450 stitches, I thought it was too huge...)
This one is 250 x 250 stitches (I cut it in half because all the rest is black stitches ; you should let almost 60 rows of black stitches above and below the pattern...
With your black 14ct aida, it would be 17,9 inches (45,4 cm) height and length ; would it fit ?
Ho, and I'm not sure of the #939 color, it's a dark marine blue in reality, I almost don't see the difference with the black #310 ; and on KG chart #939 appears as a dark brown (?). I don't know if you'll have better contrast with black aida, than with #310 thread... you should test it before...