The Alliance Station tape lines, as depicted in the Game Manual, are not intended to represent exact dimensions or positioning relative to the rest of the field.
We do not provide exact dimensions or positioning for the Alliance Stations since they are typically not critical to gameplay, which provides EPs more leeway when taping off these areas. However, these tape lines should always be placed such that Drive Team Members can reasonably view and interact with the Field from within the Alliance Station during a Match, so the tape lines should extend far enough for Drive Team Members to reach the Loaders with relative ease.
We recognize that this is not made clear in the game manual, so we're planning to incorporate this guidance in the July 2 game manual update. Though the Alliance Station tape lines shown in the game manual are not intended to be exact representations, we plan on updating the images with extended Alliance Stations to provide a better reference for their expected size/positioning.