Sorry, Mad Scientist, but I have to disagree on your optimistic view about the timescale. What you did - obviously successfully - in 12 months cannot be done in three months just by multiplying the ressources by any factor > 4. You cannot get a baby within one month by getting nine ladies pregnant. There are steps in the redesign process that need time, like finding out what was really wrong in the first place, specify the changes, specify the required test (on all levels implicated), change code and test stand-alone and integrated on all levels affected. The fix has been promised ready (we are in the holding now!) by the management of Boeing about as many times as the new airport BER in Berlin was promised to open. None of them had any bear on reality because the management had either no clues or consists of compulsive liars, possibly both. How can they fix a timeschedule when the scope of problems is getting wider and wider at a daily rate?