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OK guys, here's what I found out tonight at the Nanton museum. I asked the engineer, Greg, about the pneumatic tanks in the starboard wheel well and he proceeded to give me a rundown of practically the entire pneumatic system from the engine compressors to the charge tanks, filters, traps, check valves, etc. Long story short, the tanks that are seen from the wheel wells are on the starboard side only. Here's a pic from the manual:
View attachment 295914
The line you see running to the fuselage charges another slightly larger tank mounted on the roof of the nose, just behind the turret. I believe that tank is isolated from the rest of the system with a check valve and runs the brakes. The 3 tanks that you have in your kit are for the engine functions such as supercharger control and radiator shutters.
Here are pics of the wheel wells (apologies for the quality - shaky cell phone operator). Port well showing no tanks:
View attachment 295916
...and the starboard one showing your tanks.
View attachment 295917
The Nanton Lanc has the flare pistol holder mounted on the spar cover as you have modeled it:
View attachment 295912
Immediately above, and just forward of the bulkhead frame, is the flare socket, as Terry described it. Note that the cap for the socket is removed and hangs from a chain. The chord that you see coming through the opening is actually an electrical extension chord that the museum uses to power up lights and outlets inside the fuselage for restoration work. Again, apologies for the shaky quality.
View attachment 295915
The same opening as seen from the outside through the astrodome:
View attachment 295913
Now, I completely missed checking out the photo flare chute and will need to look into this on my next visit this coming Saturday. I must admit that I'm a little unclear as to what you are looking for here so if you can give me a bit more of a hint I'll have a better chance of getting what you need.
You're very welcome Gerry. Funny that when I was talking to Greg, he said that he's been contacted by Hatchette about reference pics for their Facebook page. I've gone over there but can't find anything. Are you using any reference links that sound like it might be this?