If the amount of the checks cashed exceeds $10K, you have to fill out a currency transaction report on the builder, since in essence he is getting the cash (and distributing it to the others).
Re OFAC - the laws are specific enough that we cannot do business with them in any manner. Yes, the risks are low, but the fines are great.
For those with name matches, you may want to push the issue and get additional ID's, or have Branch Adm provide you a letter acknowledging that they're accepting the risk. Compliance can advise management of the risks, but not usually force compliance.
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Integrity. With it, nothing else matters. Without it, nothing else matters.