Integration is a bear. We can't put it off forever. Let's do it all the time instead.
Here's an idea. Let's divide up the system. We'll all write our share of the objects. It should take only a few months. We'll all test our work. Then, when everything is written, we'll just integrate the code in a week or so, run a few acceptance tests, and release.
Does this sound like a recipe for disaster, with mismatched method signatures, objects that don't work as their users expected, and a system that won't even load, let alone actually run? We sure hope it sounds that bad.
The longer we wait between integrations and acceptance tests, the worse things get. Wait twice as long and we'll have four or more times the hassle. The reason ...