Foreclosure auction w/ no money?

[Justin H.]

Here in Fairfield County, OH, foreclosure auctions run like this:
House is foreclosed on, appraisal done on current condition (typically ~15-20% lower than ARV)
Bidding starts at 2/3 appraised value
Winner pays required down payment right then (usually 10% but occassionally, it's only 1,000 - I think these are tax lien foreclosures)
Remainder of winning bid due on confirmed sale and transfer of deed (however long that is?)

I can easily stick to the homes with $1k down payments, but do I have any time to find a buyer to cover the remaining amount? Am I allowed to put someone else in my place ("assign a contract")? Would it be unethical to have a sales contract with the buyer contigent on a winning bid, take enough of the buyer's money for my max bid, buy the house myself and then sell it to him after I get the title? Are there seasoning requirements (I guess that depends on type of funding from end buyer)?