I, for one, would hire the mold
and build from there. But I would have to ask help from friends who can laminate hulls.
Other than this, there are still some boatyards
that will sell you a deck/hull kit. It is nice - most of the dirty job is done. You are already about 10% into the total cost too.
Then again, if you order say alloy plans of something like Van de Stadt, Koopmans, Roberts or Dix then you will have no problem finding a yard that will build the boat to your specs.
Finally, if I were to build something over an existing (stripped) one, I would almost definitely chose a S&S Swan or the like - strong and pretty hull that did well and whose performance and pitfalls are well known.
Economy-wise, the last option would probably be the cheapest.