It just helps you to get better. ........write that stuff down (what worked and what didnt) so that you form your own policies and procedures.

From what I am reading is he has no paper work signed by you for the extra so he can not place a lien on items he did with out a contract.The problem is coming up due to the fact that you cut out the general contractor and started dealing direct with the sub this is why you have the problems . if it were me I would pay him 55 to 60 % on the dollar on what he is asking get him to do a release of lein that about 3,000 you just had 55k worth of renovation done to your place that you did not have to come out of pocket why would I go back and forth with the kitchen installer about 3200 dollars .Next time let all deal come threw GC and just state any changes in price have to be in writing on all project and signed off on all parties.Sign off after you get it on paper from him as well as the GC and move on.

Write a letter and send it to them!

@Iris OrtizMy eperience in writing up owner finance offers is from a Realtor's point of view (i am a realtor /investor).  

So the presentation is about to start and I decide to write notes on his selling techniques( I was really into human behavior at the time especially after watching Lie To Me). so He's going on and on and I note how he's making the crowd comfortable and making them like him with his sense of humor and such (I later Found it's called "building rapport") and I also notice on how he plays on some of the older's crowds sense of regret of not working harder when they were younger to build a better life.

Call, write and if feasible go there in person.

Been skipping between podcasts, posts, and write-ups by many members. 

Make a reasonable assumption about the rehab required, write a contract with a reasonable inspection period and make an offer.

This will help force you to write down all of the costs (including capex, maintenance, vacancy, taxes, etc) to help you think through some things you may be overlooking.http://www.biggerpockets.com/buy-and-hold-calculatorWith regards to the wood paneling you have a few options with the walls (I would leave the ceiling).  

I've also seen several of the articles that that @Brandon Turner writes for entrepreneur.com.