On some specialised shooting cases, the opened lid serves as a stable and easily accessible holder for your spotting scope. Most pistol boxes are designed to accommodate these needs of the competitive pistol shooter. It is simply your decision to find the case that is right for you. Therefore, choosing a pistol box should be more important than it seems. It must not be too large or too heavy if you might have to carry it a long distance, but heavy enough so that the wind does not blow it over.
Appearance Use the same judgment as any piece of fine luggage.
Also consider how it the case will look after two years of use. Price You will find that pistol boxes range from affordable to downright expensive. A metal 'tool boxes' of suitable size with lots of padding, or commercially available 'camera cases' make excellent gun boxes. You may still need to carry an extra bag for the other bits and pieces, but this can be easier than one large and heavy case. A spotting scope is an invaluable tool for the target shooter.