It appears SpaceX are adapting the pre-assembly skids to the GSE bunker for Pad 1 reconstruction. Most of the pump farm was pre-built on large frames; these allow whole sections to be finished quicker in more quality-controlled areas for cleaner work and less contamination from dust, sand, and dirt. For Pad 2, all this equipment was brought in and installed separately. Pad 1 appears to be slightly different; as we can see in Sanchez, the large LOX and CH4 valve skids (Orange Arrows) are being pre-installed onto two large frames (Green Arrows) This, plus the associated valve equipment on the ground floor likely means they can now be installed as complete units driven in on SPMT's (Yellow Arrows).