In a Roth you can withdraw your contributions after 5 years tax and penalty free, this is not available for traditional IRAs. 

As far as your wife nagging about honey do's around the house yet not contributing to the business, I don't think you can blame that on real estate. 

He’s an excellent person to ask if he’s willing to contribute. 

I would add some lounge chairs and a fire pit to the staging and some cafe lights.

IRA contribution rules are limited, and depending on your situation may allow for between $6,000 and $56,000 in annual contributions, with larger number requiring quite profitable self-employment on your part. 

I think it is a great tool, however what about the scenario where a manager/sponsor also contributes a portion of the initial capital?

That sounds like it would be more a capital contribution into company A.

on a side note agreed not so easy to be a charity and do the right thing.. hoops.. to jump through and lots of competition for donations.. we have done it with zero expense for marketing its all grass roots.. and many of our BP members have generously contributed..  

A contractor quoted $3500 to fix these issues which may be a bit high , but the seller came back and said he would contribute $500 to repairs.

The downside is that you have to pay yourself back within 5 years with interest, so don't go overboard with this one, but if you're contributing to it anyway then that might take care of itself.With the loan proceeds, pay off your highest-interest debt.