Not going to happen, and it won't work if they actually do try
As I see it, the main questions are:
1) Are they going to be able to raise the money? I doubt it.
2) Isn't there a better Christian thing to spend the money on? I think so.
3) Assuming they do try to build it, are they going to find that it is not structurally feasible? I'd bet the ark will collapse into rubble long before complete. Of course, before such happens, OSHA will probably shut the thing down in the name of worker safety.