You could expect to pay close to $2000 for certification inspections and compliance.
Assuming everything was done properly so far, another couple of grand to finish plus paint at about $2000 ( unless you can do it yourself). So you are at about $13000 on the road.
There have been some cheap 7's on TM recently, already complete and certified. Personally, I would be reluctant to tackle someone else's partly finished project unless it was very highly spec'd.
Up to you really, sorry.