Depending on the state in which the property subject to the land contract sale exists, the buyer will want to file additional forms to gain the benefits of being the property owner, even though technically, the buyer does not have a true legal title to the property until full payment of the purchase price is made. Such forms may be a property transfer affidavit, which you may be required to file with the city assessor’s office for tax purposes, or a principle residence exemption, which gives the buyer a tax break for using the property as the buyer’s principle residence.
For what it’s worth, I do know of at least one wholesaler who has worked in Florida for years (though he does use a title company for every deal, he doesn’t close them himself). Given the logistical challenges with assigning contracts, I wouldn’t recommend trying to do these types of deals without a title company – it requires A LOT more running around and coordination than just paying cash and buying the property yourself.
There always seems to be an endless pile of paperwork and a lot of legal hoops to jump through (everybody wants to protect themselves from liability, etc). While some of this documentation is certainly good practice – I've learned that when you boil it all down, closing a real estate transaction is actually a fairly simple process – especially when it's an all-cash transaction (no financing or mortgages involved).
You can also look to certain companies and organizations that have a concentration of people that may fall in the above mentioned roles such as investment companies (i.e. Charles Schwab, Fidelity), financial advising companies (i.e. Morgan Stanley, Merrill Lynch). There may be a higher concentration of people who can both afford and want to build their own custom homes or to build income-producing properties. Try linking yourself to financial advisors who may already know of people who have these types of dreams. This isn't a comprehensive answer of all the possibilities but just some thoughts. Good luck!