I meant "capital sized" - obviously it's unlikely to be quite as large in-game as the image.
The reason size entered the discussion at all is because that shape, on a fighter or frigate, would likely be a total non-issue; for a small ship, the AI's general margin of error in range-finding, not to mention the "extra" range projectiles get when they fade out, is significantly larger than the inaccuracies introduced by non-circular geometry. At capital size, however, consider an enemy attacking from the front with beam weaponry - it's not going to even come close to hitting armor when it's in range of the shield bubble. Some (mostly shorter-range) projectile weapons will suffer the same issue.
As I said, this isn't necessarily a showstopper - for example, if the plan is for this capital ship to use the burn drive as its ship system, then it's relatively safe to assume that the AI won't be pulling off the sort of edge-of-range kiting where the ship's shape might be an issue. Or it may be that AI issues like this just don't bother you as much as they do me, or that you expect this ship to mostly see combat against the player, where AI issues aren't even relevant. Or, etc.