@Matthew S. my decision would be based on a couple of factors -
- How long would you like this money to last?
- Does he have additional investments/assets and are they diversified?
- What are his annual living expenses?
From a strictly personal standpoint, I might have leaned towards investing that money in a mixture of stock/bond index funds. My Dad had a pension, would have probably needed the money to last about 30 years and 16k/year (4% of 400k) would have provided more than a sufficient amount of supplemental income for him, as well as having a high probability of success based on historical trends.
Your method seems great as well, but may require more "active" participation since you or your Dad would need to manage the managers. I also think you're doing a great job of diversifying to mitigate risk, but if I had a limited amount of money I would be more likely to diversify on the level of an index fund where I could potentially be invested in every publicly traded company in the world.
Your situation may differ, so I hope you're able to reach your goals with whatever investment method you feel comfortable with. I've heard good things about a number of the companies you've invested with.