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I also thought so Robert, is likely to also use "salvo rockets", although there would also be real and likely with less explosive charge.I will defer to those more knowledgable here, however I believe practice rockets were at the very least painted in different colors than their actual combat counterparts, so I would suggest looking for reference photos for WW2 era practice rockets. I will have a look myself and see what I can find.
Also, just because the aircraft carried the mounts doesn't necessarily mean that rockets were actually carried. These could be left over from the service days.
Comments to take into account Andy and Wojtek, it would be interesting to find some picture of the time, with this training squadron and mounted rockets.Sure. Also these HAVRs weren't attached there all the time. These could be attached if a flight , to the shooting area was planed for instance. So there is no rule.
With reference to your question, in the photos of my post # 63, I thinned the floodgates of the wheel / hook bay, with the Dremel.Great approach, your thinning will be interesting to see. Are you going to do it by hand with a sander, or use a dremel? If the latter can you show the bit/tool you are using?