Doing what you essentially described, Lease Option or Rent-To-Own Sales, can help you get through the legal aspects of what you are calling Seller-Financing....

Did I make a stupid move by essentially adding a middleman?  

I'm in a raise right now for a deal and in four days after my initial email, had 5 returning investors from previous deals that essentially read the deal summary and listened to the investor conf call, then sent me an email w/the amount they want to invest.  

No they never asked. if you stay in the old house for a year or more no other paperwork is needed.

Other paperwork: Purchase and Sale Agreement, Lead Paint, Seller's Disclosure of Defects, etc.

Also, having a buyers list as a wholesaler is essential, but if you want a tip - it doesn't have to be a giant one.

You could essentially offer to cosign (that's what you'd be doing).

You should be fair to the person loaning you the money and encourage them to use an experienced professional with vetted paperwork to originate this loan and ensure they are adequately protected.

Came out $4700 ahead.The risk here is that you are essentially floating your interest rate for six months.

If we open a joint LLC that essentially owns the property, is this considered a prohibited transaction because the Solo 401k Trust is an interested party in both the original acquisition and the LLC that will acquire the post-rehab property and subsequent loan?