As for painting them, I was in two minds about camo or concrete, I guess I'll go for camo.

I don't know with certainty how these installations were actually set up, but as an old Field Artilleryman I can offer some thoughts based on what I see in the pictures and actual experience.

1) While there MAY have been some published guidance or regulations on how these installations were to be set up, if these were US Army installations, you can BET that the directions of the local commander would have been implemented. If there were specific instructions in some Field Manual, or specifications, I strongly suspect that "local modifications" would have been applied, so for example in an area in which heavy rain could be expected, there would have been some provision made for keeping the propelling charges dry.

2) US soldiers are legendary in their skills of modification and adaptation. I would suggest that absent some VERY SPECIFIC photographs of the EXACT location you are trying to represent, you are safe in making some reasonable assumptions on how things MIGHT have been done, and unless someone CAN show you photographs of YOUR prototype installation to prove your wrong, there is little danger in modelling what make sense to you. Whether these bunkers had canvas or wood covering (a logical concept) I would suggest is up to you unless somebody KNOWS they were done differently AT YOUR LOCATION. If anything truthful can be said about modelling US equipment it's that REGARDLESS of what the Regs say, you can BET some unit somewhere did it differently! And as far as paint goes, you know the old Army saying: "If it moves, salute it. If it don't move, paint it." As long as there have been NCOs, they have known that the best way to keep troops out of trouble is to keep them busy and what better way than to have them paint stuff, thus providing yet another item to a)inspect, and b)keep the "old man" happy.

3)That said, one thing intrigues me about the bunker design. Clearly there are two separate compartments, and I would suspect that projos (and probably fuzes) would be kept in one and propelling charges in the other. Furthermore, I notice that one side has some semi-circular grooves cut into the concrete. I don't KNOW for certain, but I'll bet those were on the projo side. They LOOK like they're about the same diameter as a 155mm projo which weighs in the neighborhood of 100 lbs. I'll bet those were designed to set the projo in on it's side after lifting it up, so that the crew servicing the piece could then pick it up and take it to be loaded. You could also keep the front end pointed into the bunker and attach and set fuzes that way too.

Be advised this is ALL speculation on my part just looking at the photos! Good luck on your build!

Not taking anybody's build apart (or ideas), but I see some things. I lived with the 155 for fifteen months. Looking at the center of the parapet, and we see several studs where the gun will be setting. This tells me the center of the gun is bolted solid to the mount. Won't work with a wheeled gun. Probably a 5 or 6 inch Naval gun. The spades on a howitzer or long tom would have shredded those bricks like it was nothing. One can also tell that the way the projo bunker was built there was no plans for shooting rapidly. Would have been a chore fishing that stuff out of the bunker and up to the breech. Plus the bunker looks like it might hold 200 rounds at best, but probably closer to 125 rounds. Also you don't normally store powder and projos close to each other.
gary

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Not taking anybody's build apart (or ideas), but I see some things. I lived with the 155 for fifteen months. Looking at the center of the parapet, and we see several studs where the gun will be setting. This tells me the center of the gun is bolted solid to the mount. Won't work with a wheeled gun. Probably a 5 or 6 inch Naval gun. The spades on a howitzer or long tom would have shredded those bricks like it was nothing. One can also tell that the way the projo bunker was built there was no plans for shooting rapidly. Would have been a chore fishing that stuff out of the bunker and up to the breech. Plus the bunker looks like it might hold 200 rounds at best, but probably closer to 125 rounds. Also you don't normally store powder and projos close to each other.
gary

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That bolt ring does indeed suggest a fixed-pedestal gun, but the pit does bear a striking resemblance to this one on Wikipedia:

https://en.wikipedia.org/wiki/Canon_de_155mm_GPF#/media/File:155mm_GPF_Garden_Island_WA_1943_AWM_054026.jpeg

As for limited ammo, I assume those were for ready rounds, with a bigger magazine further back, possibly built into a hillside...