In addition to Matt's link, try the "On The Wire" archives at:
www.thebeachcats.com . I know people have covered this repair on that site. I would suggest you give more info on location, and size of soft spots so that they can be evaluated here, before taking her out. But by all means get her solid and get out and enjoy her! The H16 is a really fun, great boat! They are both, harder to tack, and more prone to pitchpoling than newer designs, but they are also rugged durable boats that can be sailed in an amazing spectrum of winds! I'd rather be on one than on a Nacra in 25 to 30 knot winds! They are an absolute blast in 15 to 20! Have fun!