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location Edinburgh, United Kingdom
visits member for 2 years, 10 months
seen Dec 2 at 11:16
Lots of Fortran, some Matlab, Mathematica

comment How to generate a blank crossword sheet?
It looks entirely wrong to me, even after the movements of numbers indicated in your final drawing. In crosswords I am familiar with (UK, occasionally US) there would be a 2 where you have 4 in the first row, a 3 where you have 2 in the first column, 4 where you have 2 in the third column, etc. Perhaps number the solution spaces after assembling the grid ?
comment Make a table of changes in US coinage
Impressive as Wolfram Alpha is I think my first port of call for images of US (or any other) coins would probably be Google Images. As for the currency of the coinage, that would be another search.