But, I saved a few G's, so that's easing my aching muscles.

Wouldn't surprise me, if this realtor was a friend or relative, that's trying to help out and flexing his muscle. 

Execicse some financial muscle and Pay off the student loan in three months.  

I have been apart of/acted as broker for ownership groups that have so much tension and lack of communication, that by the time everyone can agree on a given issue (say...agreeing on the extent of buildout they are willing to counter-offer a prospective tenant who has submitted an offer to lease)...that tenant has usually moved on, leaving their space vacant for additional time.This can all be avoided very easily, but when lines of communication weaken...the bottom line usually follows suit.  

However, I'd like to flex my creative financing muscle and save a good chunk of my own cash if possible.

When you define the expectation to a creative then you are assuming permission to say “this does not work”  when you have a stager that is going to get photos for marketing out of the deal they will stretch their  creative muscle sometimes accidentally not working in the best interest. 

Off the top of my head I am thinking:Me (the brains) : 40%,Contractor (the muscle): 20% (since he will be paid throughout the construction phase, and then 20% of profits after home sold)Rich Friend(The Cash): 40% since he will be providing all the money for the deal)

It's not as cool-looking as its brother the GS850G but still technically qualifies as a muscle bike.

Sounds like a great learning experience, as well as practice exercising that risk muscle. 

Then again prices have reached some astronomical levels over the last couple of years, making that potential correction percentage look like it'll flex some muscles.