My former congregation had a total remodel in the early 90's-- down to the cement slab due to mold. Fifteen years later we had to do a complete do over also because of mold. Neither was a quick build. This was months upon month's of daily labor for the local congregation-- Sunday WT on-site.
For the second rebuild the RBC came on weekends. I organized food service during the week for the local brothers, because they assigned a clueless FT Pioneer/Elder/Service Overseer/questionable landscaper (I also took on hedge trimming after he assaulted our beautiful rhododendrum with an electric trimmer) to the job. He was happy to let me do it as long as I reported to him and submitted receipts for purchases. You know the drill-- I don't have a penis.
The idiots didn't do something right with the soffits. There was a torrential downpour. All the sheet rock was soaked. They had to tear it all out and start over again. The elder in charge of the project walked away in tears that night. We were all exhausted.
This was at the same time that my son was coming unhinged. I begged for a shepherding call only to be told to wait until the project was complete. By the time they met with me it was too late. I was already on my way out the door.
They use and abuse free labor and funds until they can't anymore.