According to the attachment, the Aft LRM-20 is not hooked up to Artemis IV, but you are buying Artemis-IV LRM ammo. Is that correct?
For the rest of the attachment, it would be formatting tweaks. If a number has nothing after the decimal, remove the zeroes after the decimal. Also, pages 2 & 3 (plus the bottom 22 lines on page 1) might not be needed.
Nice spreadsheet though, I'll bet it made designing the vessel much easier.