You can hire him but if I were you, I would not; I would never put a family member on a production based transaction.

I had Home Depot install a screen door this spring for ~$225 this included product and labor, for comparison.

Portfolio lenders can use discretion, so they can offer more custom solutions and products.  

I've been working on getting our designs into Virtual Reality as a way for clients to market their products (esp. when they are building multiple of the same unit). 

I've never used them for these, but their products are usually pretty good. 

Hello BiggerPockets community, we are planning to buy a water front Single Family in Fort Lauderdale area but we are not sure about this kind of market and how is a good property manager for this product, could you please give me some advice?

But from everything I have seen, a very competitive product. 

A 100% LTV home equity loan will not be a common product and, where you find it, it will likely be at a similar rate to your student loan; so, let's just take that one off the table.So, your choice is to pay down 6.25% debt or invest and earn 6-10%.  

Maybe it would better suit your situation to put 5% down with a Conventional product."

Seasoning is not an issue with a few products and the trade off is a higher rate and terms because of the increased risk.