Go to Home Depot and ask about the bid room program.  

Are there any lending programs that allow for seller financing of the down payment in 2nd position? 

It depends on the program, the two that I am most familiar with will do 100/100 at 70% ARV but will underwrite pretty heavily and will treat it almost along the lines of a non-QM lenders and might even underwrite the builder/GC.

This is where the science of the program gives way to the art of the investor.

It may require you to maintain a specific liquidity ratio over the life of the loan, or maintain cash reserves equal to a specific number of payments, or upon inspection prior to the loan being Funded, Require you to come out of pocket with cash, for instance, to replace the roof because it has more than two layers on it, replace or grind concrete that has heaved, or embark on a program of replacing balconies that have rotted within a certain amount of time, et cetera...

What if the next regime downsizes government or we continue to decentralize it? 

But per lot it will cost roughly the following:$1,500 Electrical poles, meter installation $2,000 water taps and connections$5,000 grading and land prep$8,000 septic installation (assuming a 1:1 ratio of homes to 1000 gallon septics)$5,000 down payment on each home ($700-750 / thereafter per unit)$21,500 total set up x 17 = $365,000Ongoing expenses after development would look something this for POH model: $12,750 a month in mobile home mortgages (17 x 750 for PITI on each unit) $1,900 a month in land mortgage PITI (house) $3,000 a month landscaping$2,000 a month in reserve emergency fund$2,200 management$21,850 a month total expenses $262,200‬/yearOngoing incomes after development would look something this for POH model:$27,000/month ($1500 x 18 {17 mobile homes plus house})$324,000/year324k-262,2k = 61,800 net pre-tax profit or $5,150/month.Opportunities to reduce start up expenses: Bulk deals with the government or contractors for doing all the work at once (electrical, water, land grading, septic) Trade free rent for someone to mow and landscape (turning a $3k event into a $650 event every month).

That can mean a variety of things, and be a number of different loan programs. 

There is a program offered by HUD called "Good Neighbor Next Door".

He usually sends me over his buyers who need a renovation program then I send them back if the qualify.