As far as a PPI , you should be spending about 500.00 for an inspection...... It should take about 6 Hours , 1 hour in the logbooks , while a helper is pulling inspection panels , and interior panels , another hour to pull plugs and do a compression check , 3 hours for actual inspection , using flashlights , mirrors , scopes , etc etc ,and an hour to reassemble , and to ops check all the systems....... No time should be wasted tidying up the "little things" that will waste your time, its not your airplane.....All time should be spent on inspecting and assessing.....The lower splice is a common area for corrosion , as is the exposed rear spar in the wheel wells ...... I personally do not believe that there was no evidence of extensive corrosion on this airframe from the pictures.... Unless this aircraft was parked next to charging batterys or had some type of electrolytic fluid spilled in the back seat , That corrosion took years to acquire..... A cursory look at an airframe is what you use to decide to warrant a PPI , it is not a PPI ...... The thing that really BOTHERS me is the complete lack of accountability of the previous owner ....... That airplane is NOT safe to fly....... Not even close.........