IMHO, the brown border is too close to the green in contrast. It does not form a border around the green, but looks more like an unintentional color gradient from green to brown.
It was intentional, that the planes are like part of the outer border
Keep it black.
Other observations:
- the outside border is quite thick compared to original. IMO, a thinner border works better. The recent Rangoon patch had exceptionally thin border, so it should be doable(?)
- In the original, the main title
Battle of Britain" was bolded to make it stand out from other text. Now the other text is much too stuffed. "Aces High tm Scenario" and "November 2008" should be made smaller/thinner and they should be placed at equal distance from the outer border. November has proper distance, AcesHigh is too close to border.