Yeah you can copy an individual (3rd Party) planes folder and paste that into any game and it will run. The game you add it to may need the effects, weapons adding that the planes uses. also in WOV you may need to alter the games date for later jets because by defualt it only goes to 1973.
Transfering stock jets - you would at least need to extract all of its game files from object.cat before you transfered it.
Do the weapons in the pack show up in the loadout screen?
Radar guided A-A need a radar lock
Laser guided need a designator - some may need a ground target lock with E
Leave the HUD on normal unless you have a very high res monitor and a track IR IMO
Most of the cockpits have an altimeter - normally one of the larger dials - but you can check by seeing which ones move when you climb or dive. Will be 1000s of feet but marked in single digits normally ie 1,2,3,4,5, etc
Some jets may give you one dial for Altitude (above sea level) and one dial for "Radar Altitude" (above ground level)