and of course there is always the Harry Will Rebuild Little Chicago later thing.
Isn't the best reason for a 2.0 that you lost the 1.0 version??

With LC 1.0 Harry proved IT CAN BE DONE so he could get various Winter Minions to help gather the bits and chunks to do a New Version (he could in fact make an even BIGGER ONE) and add new features like a WayMaker and such. (Hmm what would happen if Harry FORZAREd the replica of a building with LC "online"??)

Jim said he wanted Harry to be "like a nerd" sometime back.  I think LC is Harry nerd'ing out while he learns the rules.  He also did the summoning circle that seemed overly elaborate. In SMF Harry mentioned to Murphy that most magic was symbolism and that's why he could use a circle instead of a pentagram.  Until GS, Harry was big on the physical side of things, like the blasting rod; not that he was bad at magic but needed the focus to refine the outcome.  I think GS is will be underrated in that Harry had to do everything with different symbols in a new rule system. Kind of like Harry taking a "Modern Algebra" class; the old rules and operations work for a different plane.  I think LC 2.0 will be more symbolic, from ice maybe, with just enough thaumaturgy to make it function and enough symbols for him to use it.  In mathematical and programming terms,  he'll know which parts he can abstract and which parts need to be represented.  LC2.0 had better work or Ms Duck may not be around to have Mab fix it next time.