The mechanics or retirement income

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I'm about 8 years from ER and my current allocation in Vanguard is

Cash 8%
Total Bond Index 22%
Wellesley 21%
Total Stock Index 23%
Total International Index 21%
REIT 5

I'm starting to think about the mechanics of taking income form my investments and I'd be grateful for your suggestions. Firstly would you suggest any asset allocation adjustments?

I'm thinking of dividing 3 year's of living expenses between 3 year, 2 year and 1 year CDs and having another years expenses in a MM. I'll also pay dividends and interest into the MM and make regular transfers to my bank account. At the end of the year I should have enough in the MM to buy another 3 year CD and transfer the 1 year CD to my MM. Does this sound sensible?