I helped my friend Eric do this. It took 6 days, 12 hours a day for us to do it. That translates to 144 man hours. It is a pretty big job but it was...
I would say you may want to rethink the flaps, they are a major change that adds value to the project not to mention performance. The PA-18 gear well...
Learned to fly in 1968, have 10,000 hours most SE Alaska float time. Sold 180 after 18 years of hauling Supercubbers camping gear to JC and other places. Bought a 170 so I can't haul as much anymoe...thus my handle changed to Light Hauler