My knee-jerk response to that: Do they make pink girly legos? Maybe there are reasons why that's the wrong approach, but I tend to regard interaction and packaging as two very distinct design components. If the packaging is the problem, fix that first.

Changing the interaction should come second. Dumbing it down is almost never the solution, yet it's often the first solution people turn to when trying to deal with a gender gap. It's as if they think the issues will go away if they speak very slowly and loudly.

(I admire the objective, but I believe I would like the project better if it said "an engineering toy" instead of "the engineering toy." The implication differs.)