Besides the drop tank lever guard panels that the Swiss AF added into their Mustangs, another item I like is the landing gear handle placards that they designed for their use, which actually replaces one of the cover panels altogether, on side of the trim column. They also replaced all of the limit/restrictions placards with their own, but kept all of the placards relating to the serial number/production model. In another set of photos from the cockpit of another Swiss AF/former USAAF P-51D, they actually added metal stirrups to the rudder pedals. The Swiss AF also didn't use drop tanks, so the drop tank selections on the fuel selector placards have been blacked out.
Speaking of the landing gear lever placard, I would love to know how many out there have noticed that it is secured via staples in the Warbirdsim Mustangs? Despite the fact that the placards were produced even with the cross-hairs for placements of rivets to secure the placard (like the others), they seemed to have almost always been secured instead through use of brass staples. - Just a unique little detail (like the safety-wired lock-nuts that can also be found accurately used in specific areas of the cockpits of the Warbirdsim D-models).
The main thing I want to do with a wartime example like 'Tear, is show them exactly as they were, during WWII, which has never been done before for a flight simulator platform. Most efforts always try and depict examples that were manufactured too late and didn't serve in WWII, or end up mixing things together, from one variant or another, or adding something that they've seen in a photo from a restored example, which was never there except for on that one restored aircraft, etc. I also want to illustrate why it is a certain way that it is - how the cockpits are configured for one purpose or another. I enjoy these types of projects where you can also see how the cockpit on one of these aircraft looked, almost "straight out of the box", or in-service early on, and what changes were made, and how they were done, in the field, to upgrade them to more advanced standards later in the war. It also helps to show just how authentic warbird restorations are getting these days, and providing that option to not only re-live what it was like to fly the aircraft during a specific time in WWII, but what it would be like to jump in the aircraft that actually exists today, in its real-life form.