Reduce labor expenses, you increase disposable incomes, reduce cost of goods, reducing cost of finished material goods, creating a compounding effect of savings that all culminate in a significant reduction in cost of housing production, increasing production capacity, increasing affordability, invigorating economic activity, raising tax revenues via the Walmart method of volume over profit margin..... 

Have you considered land as an alternative to wholesaling houses? 

Alternatively you could do a smaller a cash out amount and a private agreement for installment payments to each party secured as a second lien post closing. 

Curious where everyone sources their material for flips/brrrs? 

When not 'full income' verification, which can even allow for high 55%+ DTI there are alternative income verification guidelines like bank statement, P&L, DSCR, Foreign National, Asset depletion, bridge and portfolio programs that allow expanded ways for borrowers to qualify. 

This opens you up to advance on your plan or pivot into an alternate path.  

Factory built with its potential for less material waste was attractive.

Are there alternative ways to do this that are more hands free for me but still effective? 

There is also I think the 500 hr material participation requirement for the $25k PAL to take that onto your1040. 

Perhaps emptying it so that it can attract an owner occupied buyer is a good alternative or hiring a PM company to off load some of the work there for you.