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Sharp, that F18 thing was nice, but it is harder to make a realistic sim of modern jets as much of the information on the planes is restricted or classified. No sim for sure uses real radar data or frequencies etc. Also the procedures in many of them are off etc. But nevertheless give a nice view to what it can be to operate a modern jet
Regarding WW2 planes they are easier as nothing is classified on them anymore and such. Only thing is how to obtain all the data as much of it is lost, for reason or another. There are books for sure, but many just repeat common things heard over the years and very few really critically look into things and dig up new data.