Just two suggestions.
First, and I guess you know this, the pitch ladder is suffering from the same thing as most HUDs I've seen in MSFS. The picture used for it is too small so the lines in the ladder in't really following their indicated angle. That is, thy indicate the right angle whn you are at that angle but then they don't move according to the world. You can see this best on th line indicating the horizon. It should be "glued" to the horizon, but it's not.
Second, it would be very nice if you could make the contrast of the HUD change with the background. I don't know if all fighters use this, but from reading the documentation for the SAAB JA-37, I found out that the HUD is ajusting the contrast according to how bright th background is. I gues it won't be possibl to meassure the brightnes of the background in the sim, but it could change according to angle to the ground and angl to the sun.
Other than that, you're doing a great job.