Typically the sink waste arm(drain) is located 18" above the floor and centered with the sink finished drain opening.

The H&C supplies are then set 24" above the floor and spaced 8" center to center. (4" on either side of the waste arm)". You may need to install additional wood blocking.

The Watercloset supply is 6" to 8" above the floor and 6" to the left of center. May also require additional wood blocking.

Having said that, it must also be noted that the stubouts should be attached to the line before mounting in place, otherwise it is very awkward to crimp the joints.

Thanks lazypup!
I have a followup question then...... For instance under the sink, do I brace a 2x4 flush with the studs with the top of blocking being 28" (so that it stubs out at 24")and clamp the copper ell behind the wood blocking and on bottom of the blocking 2x4 to prevent it from moving up or down and either side to side? Make that two questions:-)....how high so I mount the icemaker box or do I have to mount one? Thanks again!!!!!!!

There is no standard measurment for your water and drain lines! They have to be stubbed out with the measurments that come with the fixture that you are hooking up, if you don't want to do this keep them low, too low and they will work, too high and you are fxxked! Lots of luck.

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"If all else fails, read the directions"