If you are not a contractor it is probably not worth getting into major rehab like this. I buy houses like that and sometimes I eat it, but we have the equipement and crew to fix things inexpensively and not go broke if we discover a disaster.
I would get several full price estimates and submit them with your low ball offer and a letter of explaination to whatever high school drop out is handling the foreclosure file in Ohio or India so they will realize they have a pig in a poke and if they want to dump it there is your offer. Banks don't like to sit on junk properties. And Realtors don't like to include additional papers with offers.
Realize some idiot will probably come along a bid full price not realizing the place needs 10K in repairs - and they will just slap some paint and wood putty on a flip it to an unsuspecting first time buyer with stars in their eyes. Sorry, a bid jaded tonight I guess.
Hope you can close the deal.