Some places online may be cheaper, also depending on the amount you are planning on getting will be able to lower price pretty much. cheapsigns.com does 100 sings for $199. 

@Jack B.It all depends on what you use the cash out proceeds for.

As a community i bet we would all crowdfund a project with a quick turnaround (3-6 months) in between our deals for a reasonable return (5-10% depending the experience of the developer)2.

If you go that route you need several documents to protect you and effectuate taking over mortgage payments (POA, notice to release, etc. )If you only have a strict 90 days to do this then in your agreement that should be spelled out but several things depend on your relative and how secure he wants to be in the fact that you will basically hand the house back over to him at the end of 90 days if you haven't sold it.

Depending on the type of property and the market the 50% Rule is usually fairly close for expenses.How accurate is your ARV? 

It depends on the product and where you're building @Yasser Siddiqui.

I think it is going to depend on your specific area, the midwest is fairly large and prices will vary by location. 

Like it should be 4% rather than 0.04% interest for the refinance 5 - The above^ may kill the deal if recalculated and you're hoping to hold, but also consider if 30k is enough meat on the bone for you if you plan to flip, as you may be paying some closing costs too (depending on your market) when you sell, as well as unexpected costs

Depends on what exactly you're looking for - what strategy.

That is going to depend entirely on your locality.