We are about 75% done with rehab and have temporarily run out of funding due to life changes.

All deals should receive a written offer with proof of funds.  

I have the opportunity to help finance a short term funding need for an investment I am an equity owner in.

Have you ever considered transferring the 401k funds to an IRA and then having the IRA invest in real estate?

Basically, its an auction type of sale, the winning bidder has to have funds right then in cashier checks.

When you cash out, the funds from the new mortgage will be used to pay off your current first and second mortgage and cover your closing costs so your HELOC would be closed.

.- That's why I was thinking about 'cashing' out until the next correction and then using the funds to get back in....

At the moment these are the only strategies I know of that  can potentially allow me to generate quick funds so that I can get into other kinds of deals.I'm hoping other experienced investors can share experiences and insights to these concepts and guide me in the right direction.

I am 80% sure I will be able to get the house for $450k and have the funds to get that.

I revommend going with one that you feel comfortable with and that operates as close to a traditional lender as possible, as they are unlikely to fund anything that is too risky.