I was raised in the truth and participated to some building work and very early on (before I was 20), I questioned in what way building stuff had anything to do with the preaching work.... when they get to the point of building a hall, they have a steady income by that point. So, why not get a mortgage with a bank?
Don't get me wrong, I do appreciate the idea of maintenance work and small repairs being done by volunteers. But full blown construction projects where people are taken out of their house for months on ends... what does that have to do with Christianity?
When they start any sizable project, they compare with the construction of the temple... the same temple that Jesus said he would bring down as the truth was not in a building, but in people's heart!