AndyW wrote in
:

I found that the best way to align holes was to print out a full sized
drawing of the hole layouts, glue it on and then centre punch the holes.


Seconded, totally! Also, can't beat a good X/Y machine table on a drill
press. 1mm dril, 1mm increments, any shape you want. Join the dots... For
one-off projects the speed is good, the precision, amazing.