Got it as a side project, but too do list is too long already!
Original idea was to convert Normandy 2.0 to pre or on D-Day version - most of the Airfields on there are all temp fields constructed post invasion & loose the immersion of D-Day itself.
Process was to have a few flat static texture plates to cover existing airfields with selection of liveries to suit the environment (grass,fields, plots etc) & a few different sizes, for varying needs.
Can edit out the existing Buildings/Hangers etc with the ME triggers & even replace a few with some great WWII buildings made by Hawkyeye or forests etc (made by VPC), to make look more natural.
Could use the same concept to convert modern to WWII airfields, remove modern & replace with WWII buildings & hangers.
Use the flat ground plates to replace concrete with glass / dirt runways - I'll add some runway liveries as selections from Normandy / Channel map.
There are sometimes alignment issues with placing big flat objects, but hopefully airfields should be quite flat? Right?
Can't promise anything soon, so please be patient, or if some else can run with it?
Static object would be a simple flat plate with a few size options (& no collision box). Liveries could be extracted from one of Barthek's excellent Terrain mods, or even just Screen shots in game.
Can add destruction layers to surrounding towns with some smoke & fire effects to make the modern towns look less modern
Suntsag also had a great Marsden Mat mod to overlay or create your own airfield FARP - found here DCS Marsden Farp
Not sure if it works or download is still up, is pretty old. If not PM me & I'll send what I have & you can try out