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Here is a simpler way, with less overlap and unnecessary duplication --
40%, Schwab Total Stock Market Index SWTSX, er = 0.09%; or SCHB, er = 0.04%
20%, Schwab International Index SWISX, er = 0.19%; or SCHF, er = 0.09% (developed markets only)
30%, Schwab Total Bond Market SWLBX, er = 0.29%
10%, Schwab Treasury Inflation Protected Secs SWRSX, er = 0.29%; or SCHP, er = 0.07%
Wiki article link: Charles Schwab
suggests, its probably best to coordinate with your other investments.