I do not find dismemberment to plausible. Dismemberment is done for purpose in a "typical" murder. Removing a body from a apartment complex, for example, when moving a large object can be seen, and easily remembered later by witnesses. It also creates a large amount of fluids and forensic evidence (...dry heave).
If PF is removing a body from the condo, it is easy to do after dark, with large blanket or sack. With an intact body. Dismember to a smaller size creates more trips to the truck. Most people would have a very hard time cutting a body, although PF surely had to deal with unpleasant tasks on the farm.
Dismembering away from the condo would more an option, but why would you with the wilderness staring you in the face?
Do not see this as an option.