Problem is I've already got a Mk.8 sight that's as big as I can make it, (256x256) and it's STILL half the size it should be. The dimensions of the BMP file don't make much of a difference. The max size the gunsight displays is controlled entirely in some manner by the aircraft model itself.
Did some pretty thorough tests a while back on this, too. The gist is:
Mk.8 had the outer ring at 100mils, middle at 50, inner "pipper" at 25. The sight was calibrated so that an aircraft with a 30ft wingspan would have its wingtips touching the 25mil ring at 400yds, 50mil ring at 200yds, and the 100mil ring at 100yds, which would be pretty helpful for giving the pilot a quick-glance estimate of range if he knew the wingspan of the target (and since my guns are centered at 200yds, would give me a nicer indicator of when to shoot rather than the range counter which is much less specific).
Through a combination of using the target and the Dora offline (which has a wingspan of 34ft, close enough for the test) I confirmed that at default head position using the full Mk.8 sight (the one with the extended crosshair, not the version that just has the rings) the Dora's wingtips touched the 50mil ring at 400yds and the 100mil ring at 200 yds, precisely double the distance it should.
Moving the pilot's head position forward to correct it is too impractical with the way the fields of view are modeled. You'd have to move TOO far forward. Additionally, while it's not how the game is CURRENTLY modeled, the gunsight SHOULD stay the same size no matter how close/far you position your view
Doubling the size of the sight would do three things:
1) Most importantly, it would make the sight picture in the F4Us a LOT clearer. As it is, the gunsight is so small it can make the target very difficult to see unless you're using a very high transparency level.
2) It would make the size of the Mk.8 historically accurate.
3) It would place the bottom hash line on the lower crosshair of the Mk.8 at the top of the F4U's engine cowl. This is significant because the hashed crosshair was used as reference for aiming ordinance, and the F4U's typical aim point with ordinance is between the pipper of the gunsight and the top of the cowling depending on dive-angle, altitude and airspeed.
