It looks that you already have the experience and knowledge to administer your own Solo 401k plan.The funds from other retirement accounts can be easily moved into Solo 401k, the process is pretty simple.

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It is much like your day job where the company sets up a 401k as a savings benefit for the employees of the company, just that a Solo 401k is very simplified to administer because there are no non-owner employees in the plan.The rollover funds in your current employer 401k most likely can be rolled over to either an IRA or Solo 401k that you establish (check with your plan administrator, though).  

The interest payments on the installment contract and the loan are identical to one another and are administered by an escrow agent. 

The department may administer oaths, examine witnesses, and issue subpoenas.

You can negotiate, sign contracts and administer expense and income transactions.  

Having worked on many a 203K in my career I can tell you as @Greg H. mentioned you want to make sure you have a team in place who is familiar with the process and understands how to administer the 203K.  

It doesn't cost a company any more to administer a 10k account then a 100k account does it?

I know these are pretty rare and I have been searching for a company that handles them.Thanks,EdHi Ed, Yes, we have administered many 1031 Exchanges that involve cars, boats, planes, trucks and the like over the years. 

For legal title to pass from mom to her 6 children, even if a will exist, the estate must be administered in probate court, where the court will issue a deed transferring mom's legal interest to her heirs.