Not a fan of zombie style lowers but no doubt this could be fun especially with the 45ACP upper. Not my cup of tea but interesting. Definitely let us know how it does because this sure isn't your average AR!
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek