If someone came to me asking for this I wouldn't be interested. I would have a small consulting fee with a significant amount of risk if things don't go well. Bad reviews, litigation ect. It might be hard to find a contractor willing to help.

An architect would be better suited for this, however their estimating accuracy may be less than desirable. Some architects actively keep up with current construction costs, however others don't work much on the back end of a project (only the design) and don't know the ins and outs of the construction process. This says nothing about their capability as an architect, just that they may not have a ton of experience after the design is complete.

I think your best bet would be to find a general contractor that is willing to let you do some of the work. Essentially you become a subcontractor for them, except you aren't paid. He hires all the trades that you can't do, and he supplies the materials. Yes you would be paying a GC fee, but it would help to reduce your risks. Not sure if you will find a willing GC, but worth a try.

Best of Luck

Thank you so much for taking the time to provide that insight. You touched on a few things I was thinking...especially the liability issue.

We may just have to start opening walls and see what's inside! Or maybe do some research before we break out the sledgehammer.

Before you bust into any walls, if you are wanting to take walls out, get someone that is qualified and knows how to determine if they are load bearing. You cant always tell that from opening up a wall. They will need to go into your attic, and they need to know exactly what they are looking for.

There are independent project managers/owners' representatives who do the sort of thing you're asking. I suggest you inquire at your local building/codes compliance department to see if there are any in your area.