She's looking fantastic, James! The decals look great. Can't see any evidence of lifting, so I think you'll be fine.
Oil weathering can be done any number of ways. I prefer either thinned oils or water colors brushed on in the direction of airflow. I usually blend them or smooth them out with a cotton bud until I get the results I want. I also use pastels. Depends on if I'm going for new leaks or old stains. Hope that helps.
Cheers,
Bud