My suggestion would be to try building it from scratch that way you'd have more flexibility. The grid would be tailored to your specifications and it'd have a personal touch. Your 9 letter entries should be within rows 3 and above, your 14s row four and above, experiment with the placement (side, center etc.) Then add the individual black squares, remember to add two separator block fingers on the edges. This helps with your word count, pay attention to the block limit and word count whilst tweaking your black squares. Tweak them till you've created a design you're happy with.
At first it may be a little daunting, though with time you'll be able to create complex grid designs to suit your taste.