Welcome Keith,
not being a model builder I can't help much but have you tried some of the modeling forums? Seems most that are available have to be bought. However, have you tried these:
RC Model Airplanes Free Plans! - Site Search
Some require a DXF (CAD drawing) viewer which are readily available for free, for example
freedwgviewer.
Presumably something like this isn't detailed enough:
P 51 D 