Nice to see the prices of most of the things. How much has the car itself and all of the additions cost you total up until now, and how far into the two year period are you?
Depending on mileage and where you're at (plus any number of other "it's a jeep thing" factors), KBB puts the 2011 Wrangler Unlimited 4dr Rubicon at around $19-22k USD - which sounds about right to me (that's with standard options, white color).
You might be able to find it for less, but it is doubtful.
I'm in the DRC right now, slogging through the mud!
I have no idea, though it looks like the trip will grow beyond the originally planned 2 years.
The price of the vehicle is hard to pin down, I bought a lot of parts by partnering with brands, so I got discounts.
The important part to remember is I drove AK-Argentina in a $6000 Jeep that I sold for $5000 at the end !