YIKES!!!!! 30+ foot boats are expensive!!
This tread started with replacing the engine, now it''s ok?
To understand how you can get screwed, you need to appreciate your lack of knowledge about the matters of which you speak. Having answerted your question, let''s focus on going forward in a positive manner.
If you want to manage the risk of getting screwed, you should get professional advice to ballpark the costs of putting this boat together. Have the boat surveyed, and then have an experienced yard manager quote in detail the cost for a yard to do the work involved. Using his parts costs and a realistic evaluation of what you can do properly yourself, and put in a fudge factor of two for any work you won''t do yourself, then you make some form of informed decision before starting to write checks, so you at least know how many you will be writing.
Good luck, and keep us posted.
PS - if you''re going to sail this boat in the Gulf, why limit it''s sailing performance with a winged keel? I''m not familar with the Gulf, but didn''t think it a Bahams-like area. Did you get the advice of a marine architect on the configuration of this keel so it best maintains the handling and stability of the boat, or are you so-to-speak winging it?