When I started building in Dec.'06, the cost estimation said $something like $60-85000 for a QB-7 equipped like I was planning. I thought that was high, due to I'm pretty frugal and shop around getting some great deals. BUT when everything was finished and added up I near the upper end of that estimate.....sssh don't tell my wife.
Today when I plugged in those parameters in, it comes out $69-91K.
I am guessing you have to be very savvy to get to the low end estimation.
Presuming the Van's estimator is accurate, (which it seems to be from the replies) the above numbers are quite interesting. In 4 years the low end estimation went up $9,000 and the high end went up $6,000 for an average increase in value of $7500. This says a great deal about your RV "investment" in a down economy. Factory built aircraft as you all know haven't done as well.
If you think building is expensive, wait until you start flying!