S24 likely also has (or will have) a rack dispenser system to go with the door; but it would have been installed piece by piece, not as a prebuilt unit.
They are near the center engines. Elon (I think) has recently said that there is difficulty in the "spark plug/torch igniters" startup process for Raptor (I can't remember where though). If there is an issue, then these could be some sort of smaller engines that are there for the start/restart process. Just a WAG on my part though.
Okay, with the understanding that you are just tossing out a WAG
I don’t understand how a pair of “smaller engines” could be part of the startup/restart process.
Settling thrusters are needed, but that can also be done by the side mounted RCS quads (quints?).
With the caveat that I am most definitely not a rocket scientist, the location of those structures seems an odd place to put some kind of “thruster” as the exhaust would be off-axis and wouldn’t the throat of a thruster be dark? If they are for tank cleanout and drainage, why a pair of them on one side of the three center engines?
The upper RCS could correct the off axis issue. If it was a cold gas thruster fed from the tank pressure, there would be no combustion to darken it.
They connect to the normal fueling ports during transport, I believe. It is self supporting when not pressurized, but it's stronger if pressurized.
I don't think so. More likely standard frequency antennas for direct ground link. Shiny side down. F9 booster is sporting Starlink now, but it's apogee and ground speed are much less than Starship.
The top row of missing tiles isn't at a pressurized (at least tank) seam. May require hand fitted tiles and mount points and they are waiting to do that. Those are also at bend in the surface which may need custom parts.
