If he doesn't have enough credit to carry that then you don't want him.Second, tell him you have no problem paying for the materials once they deliver them to the job.

The one newer product that delivered in 2016 is lackluster, has limited amenities and doesn't even offer furnished washer/dryers. 

I would only buy it if the unit is delivered vacant or the tenant is set up and approved for rent relief where the govt pays their back rent.

Newer and newer requirements are becoming mandatory slowly in design be it high energy efficiency, material which gives more light-air but blocks noise pollution, unhindered connectivity, better insulation, common areas designed for privacy.Which trends you think will be in future of construction specially in term of Design phase and Materials which will allow designers and developers to deliver future requirements.

And you have to be ok with delivering bad news and not be afraid of conflict - because it can spring up at any time.

I agree with @Russell Brazil you don't close if the property is not vacant and delivered as expected.

We will teach you how to find deals, what to say to prospective sellers, how to write and deliver a contract, what is the best exit strategy, what is the best way to structure the deal.

The whole purpose of earnest money is it is basically a bond you are paying the sellers to say you will deliver on sale. 

I'd start by writing what you want your new life to look like then match that to a few areas that can deliver it, the rest will take care of itself.

Additionally, even if it was not illegal, these numbers provided by the original poster do not show enough spread to allow for a middle man to make a profit and therefore it would likely lead to the wholesaler having to use some type of contingency clause to back out of the contract when they cant find the buyer at a price that delivers them a fee.