^^
Okay, the answer to that one is "no". We did that, and we had family for plumbing, electrical, finish carpentry (kitchen / bath cabinets, interior doors, fence), interior painting. We did the hardwood and tile ourselves, the landscaping, siding, eaves and soffits, demolition, and some of the rough carpentry. We were the general contractor. Because of the volumes and relationships with contractors who were family, we received steep discounts on supply, but not at the volume builder levels, of course.
At the end of the day, we still spent about 20% more per sq.ft for our home than one we could have bought directly, already done. Lots of things went into this, including having to carry 2 properties for 6 months, not buying "builder grade" finishes in bulk, like light fixtures for some items, surprise changes from our original plans, carrying the cost of sub trades that ended up with swine flu, and the customization which created surprises as we went. Smaller things like the number of peaks on the roof driving up costs impacted us.
Also, lifecycle upgrade decisions -- insulation type and quality, addition of a true subfloor over the concrete in the basement, central heating versus baseboards, better efficiency on the windows, an extra skylight to reduce daytime lighting needs... all added in costs above builder's grade.
Yes we have a better home, but it cost almost double our estimate going in, and ended up being 20% more money than buying a pre-built home, despite all the free labour.