Or is potentially my only option then to look at hard money loans?

I am actually thinking if I should purchase one for my primary residence. 

YOU will need to send the money to the individual and do this manually.

This is the problem with people that want to buy properties to Rent and try to make Money without any knowledge. 

They are free to sell their cryptocurrency and then use that money as try downpayment. 

I wouldn't be selling in this market personally, so if you don't sell the SFR and you really want to do this, a DSCR cash out refinance on the triplex, or a hard money 2nd is your only option to get the liquidity needed to make this move.

They will be built by those that want to profit from cheap labor to put more money in their own pocket.  

It's not an amount of actual cash because that changes depending on where you want to invest, but a percentage.

definitely can get a no income driven hard money style ground up construction loan covering 50% of land and 100% of construction 

This deal was actually on the MLS!