sounds like a good start to me. -setting these things up is tricky, there is a fine line between pushing forward and overtraining, you may also want to try smaller walks as warm-up building toward long walk at end of session, like with a tolerance table----if your really really pushing, make shure your in a safe situation, don't fall and crack your head open--------i've gotten similar benefits without the breathold by doing max out sprints up a steep hill, recovery on walk back down, all out sprint back up, after about 25-30 of these my legs power down almost identical to a heavy dynamic session or max apnea walks. I like this method because it mimic the similar activity vs. recovery as I would deal with in the pool, not been brave enough to do uphill apnea sprinting yet.
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