Multi-syllabic words can a tough are for students with articulation or phonology disorders as well as apraxia. I have had a few friends work on these words using different methods: clapping the syllables, tapping them out, hopping, etc. The problem was that they always went too fast or would add extra sounds or more claps, hops, etc and it would throw them off.
I found having students step out the syllables works great! Write the syllables of the words on index cards, post its, whatever you want to use, and place them on the floor for the student. Then, have them step to, and say, each part. Make sure you place the index cards, post its, etc, far enough a part so they have to take a larger then normal step. This gives them a visual for the syllables and slows them down, so that they can’t take extra steps and add extra syllables.