I have a cabin near Cassville, just down the road from Shell Knob. There is a grass strip at nearby Turkey Mountain that is pretty nice. The properties at Turkey Mtn are kind of isolated, so you probably would be happier at that location than landing there and driving to Shell Knob. Cassville is a pretty nice airport, east west and 3000', permanent cross wind, but pretty easy for an RV. They let you park an airport car for no fee, at your risk, but the drive is a little further to Shell Knob. Springfield is the nearest big airport and a delight to fly thru. They are always very helpful.
That whole part of the lake is the best in Missouri IMHO. We live north and bypass Lake of the Ozarks to get there. Tablerock lake is usually clear, great water skiing, fishing, boating. It's a Corp lake so more controlled, but not heavy handed and good for the water quality. Make sure your buy includes a dock if you want a boat, as getting Corp permission for a new dock is basically very hard to do. That end of the lake is a great way to spend a weekend with the family. The other end of the Lake near Branson is much more developed, with more off the water activities.