What is the verb of 要回过头来走老一辈的路? In the following sentence:


  奏月家从爷爷那一辈就开始做豆腐，奏月的父亲不能理解，女儿读完大学，为啥要回过头来走老一辈的路，干这种苦差事呢？


I think the sentence would mean something like the following:


  奏月's family started the tofu business from grandfather's age. 奏月's father cannot understand why his daughter want to follow what her grandfather did, even if she had a bachelor degree. It's not a good job. 


But I don't understand how it works grammatically on the bolded part. Specifically,


要: auxiliary verb, to mean "will" or "going to"
回过头来走: should be verb
老一辈的路: the path of her grandfather


Now, about the verb phrase:


If 回 is a verb and 过 is a past particle, what does 头来走, specifically 头 mean?
If 过 is a part of 过头 (go beyond the limit), what does 来走 mean here? Is it a particle? So 回 (come) and 过头 (go beyond the limit) and 来走 combined, it is something like the will + come + to go beyond the limit + to take the path of (来走), right? Or does 来 work as to~ (in the form of V + 来 + V), and not a particle?
Also, if 过头 is a verb here, what does the sentence mean at all? I feel go beyond the limit is quite an awkward here...
"回过头来走" should be interpreted as 回(过)头 - 来 - 走. Then

回头 - turn round
来 - to
走 - go/follow


过 is used for denoting the completeness status.


  用在动词后,表示完毕。如:吃过(吃完);起过(已经起床完毕)


Your understanding of the whole sentence is correct; but you lost the meaning of "回过头来" (turn round backward). 奏月's father is confusing; his daughter has graduated from college and could engage in some modern, advanced or easy job definitely. But she still decided to take tofu making as the work, even it's old, and hard.