Yes the prototype image displays the mounting point for the upper side skirt armor block (or ERA), but the bottom block does not appear to have a form of mounting. That could indicate that the lower blocks are fixed to the upper blocks. Which means you have to remove the entire section to conduct track maintenance. Which sounds like protection requirement was more important that maintainability requirement.
Or the lower side blocks have some sort of attachment to the upper blocks that the crew can remove with the tools they have on hand.
Finally if you have to request lift assists from Combat Service Support BN (or CO) to remove armor to conduct maintenance, that would add extra requirements onto the CSS maintenance Soldiers without increase the number of materials handling equipment (HME). That would increase the number of MHE in the CSS unit to support the Armor units every time the armor unit conduct maintenance. Which I find impractical. That is why I lean to the crew must have some sort of way to take the lower armor block on with the tools on hand without lift support or MHE.
Since we cannot see up-close the lower armor blocks and how they are attached, I think for the parade these blocks are on for show. Does this make sense?
