(maybe<--which is better than no).A place to start would be learning how to (safely) cut checks to sub-contractors in your state using lien releases (different states have different laws about this).Then once you master that...Learning how to read a CPA provided Profit and Loss Statement and Balance Sheet for a development project, and how to read them "compared to budget".

The other option would be to talk to an attorney and see if they can draw up a simple agreement releasing you from liability, and allowing her to keep the trailer there.

Once the tenant on the new property pays down the equity for me in 10 years then the lien can be released.  

CRED iQ, one of the largest commercial real estate data companies released a report that found in February of 2023 34 of the 50 largest MSAs they track saw “comparatively higher levels of distress in commercial real estate loans” with approximately 21 basis points more of distressed rates than the previous month.

And then as you are waiting for them to fill (right now I'm waiting for two to fill), GF might release another batch of loans that are more interesting and you regret committing to the big ones.

Use a bank.Also, look up "release fee" a stated value for each property to be paid in order to release that property, otherwise you may not be able to sell if you need to. 

As the investor/lender I would want to see lien releases from all subcontractors with each draw request along with proof that the work was completed through requested draw. 

I do not know much about the market but higher end rentals generally take a bit more time to get released because there is a smaller pool of renters who can afford it.

Do you allow for partial release clauses?

I'm not sure if you can work on a site as a volunteer regarding having workman's comp covering you.Insurance may dictate authorized personnel only.You need to know about getting utilities stubbed in, framing terminology, a good on time on budget electrician, plumber, all trades and an accountant for taxes and bookkeeping (as you don;t know how to track the house costs on the books for when you sell).Lein releases for your area, good subs from flakes and poor workmanship subs, and etc, etc, etc.You will not learn this in a week, but a few weeks around the construction site and youtube research might be useful---just don't ecpect the workers to take time to chat with you and teach you--they are there working hard earning their daily bread (beer).Good Luck!