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No the blocks are in the right order, if you look at the link you see they are the same as the simulink model i posted.
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No that is not right. The link diagran puts H0 filter followed by down 2,
your model puts rate transition then LOwPassFilter.
Am I looking at the wrong link. Moreover it defies theory to put rate transition before decimating filter.
For DSPBuilder you will choose blocks of decimator/interpolator and connect them. You choose your coeffs as well which might well be same as your or scaled for unity gain. The rate conversion is implied in the filter itself. Once done then you run DSPBuilder to generate code and testbench.