Then as soon as I can after rehab, I refinance with a traditional lender for close to my ARV ($300,000) , pay off my remaining $117,000 with the seller's note, then cash out my equity and pursue other properties while cash flowing the 6-plex.Am I crazy to think that a seller would even consider something like this?

This doesn't work with a traditional mortgage.They pay the $45K, you get $5K, and the seller gets $40K.Done deal. 

High-end backsplashes...glass mosaic, subway tiles, etc.Hand scraped hardwoods for traditional feel, real wood not engineered and definitely not laminate.  

And in places like Florida or Nevada, it is highly doubtful your traditional buyer is paying all-cash for a $200,000 or $300,000 home.

You may not have to quit your jobs to get access to the funds, however.Chris, as an added bonus the Solo 401k can offer both traditional and Roth in the same plan.

There is no blanket answer.The traditional hard/private money loan is not much different than a conventional loan, involving payment of all points, fees, and origination costs when you close your purchase.

In my area, it is common for larger apartment complexes in the 6-20 unit range that are separated into smaller parcels of 3 or 4 units so that they can be bought with traditional residential financing.For example there is a 6 unit complex for sale that I am looking at that is two separate 3-plexes on 2 different parcels of land.

Traditionally a percentage of the raise is paid to the person who raises the cash. 

I'm sure many people have struggled with this question before me- should I cash out my more traditional investments in stocks/bonds in order to expedite my ability to buy property?

I think I would have to do a cash out refinance with a traditional bank once the property was repositioned though.