Thanks T-Bolt. Good tip, it may prove useful. I did close up the wings, but I can still work on the sides of the cut-outs. I've been scraping the sides with my knife from time to time.
The fuselage halves fit well together with a minimum of sanding. However, the wing to the fuselage joints took some filling, sanding, and effort.
You may notice the piece of stretched-sprue across the top of the engine cowling. That's just filling a small gap that barely caught my fingernail, but persisted after sanding. It's attached with Tenex Plastic welder. I'll cut it, scrape it, and sand it. That should take care of that gap.
I still have to rescribe some of the panel lines that I sanded over/around. Rescribing is difficult for me, so it may take some time.
Semper Fi,
Chris