self directed 401K, newbie question

[Sean Herndon]

Hi,

I am trying to think through how I might use a self-directed 401K.  My wife and I are newbies, so please bear with me.

If I understand, a participant can defer up to 18K to a self directed, and a corporation can defer a profit sharing amount of 25%, including the employee deferral, of $60K (variances to rules if single LLC, older etc)

So if I wanted to leverage for a flip this year - how would the mechanics work?  can I only "capitalize" the 401K for 18K, and use that as a "funding partner" to purchase the property?  and I would need to close it in the corporate entity? then the 401K could take a pro-rata portion of the profit?  can the corporate entity also then contribute profit into the 401K? 

Am I on the right track?   I am trying to defer as much as possible into the 401K