As a former Irwin44 owner and one who has several friends with 38's, I would say you are wasting your time and money trying to make a 38 "bluewater".
While the glass itself is strong...the underlying structure of the boat...the hull to deck joint, the hull rigidity and the bulkhead integrity are not sufficient for extended bluewater cruising. If you are making improvements for the boat for coastal or Caribe short passage cruising, then fine. I loved my Irwin and it served us well...but it was not built to cross oceans and nothing you can reasonably do will make it so. You could get lucky...but do you want to NEED luck?
Have you actually been in a gale in the ocean in your boat for a day or more or are you doing your work on the speculation that you can make it blue water capable?