I have a mechanical murphy bed product I have used in our vacation rental that people absolutely love!

A pure soul might even offer them a market loan product in second position personally. - Let them list the property and make an offer in the context of the market. 

But this morning I was thinking that’s the only product in the world that  someone can advertise something at a certain price and you go to buy it and they say no I’m raising my price. 

While immersing yourself in various aspects of the field may enhance your understanding, a developer doesn't need to embody all the roles he/she hires.

If that is the case, you will most likely have to use more of an “investor” loan product, which will have a higher rate associated with it. 

Is there some loan product or solution that I should look into to try and get enough for this property?

Additionally, with access to cheap financing and the potential for a favorable appraisal after the upgrades, investing in these major expenses upfront could enhance the property's value and your overall return on investment.

Correct entry point, feasible budgets, project costs less than 75% ARV, active market place - good product doesn't sit long. 

there are some 85% CLTV products out there for full doc and bank statement loans 

Enhance the outdoor space with a BBQ grill, comfortable seating, and a dining area.