Under any scenario, your moving to PR would be an economic disaster - no matter how bad it may be for you in Newark or wherever you are located right now, the economics of the construction industry in PR are worse.
You will spend a lot of money on your move. You will need to ship a car, which with shipping and registration costs of over $1.5k, or buy one here. You will need to find accommodation, etc. The cost of living here is akin to living in DC.
More importantly, you will not find work. If by some miracle you do actually find some work, you will not be paid.
Suing in State court is not a realistic option. Such action will most likely cost you more than what you were ever owed, the legal process will probably take years, any chance of an eventual favorable judgment are remote and finally, the chance of actually recovering on any favorable judgment are basically zero.
I practice bankruptcy law and most of my clients are property developers, construction firms, or their respective creditors so I know what the market is like: There is no market.