In a follow up message to Norbert about the Italian CB22 submarine, I wondered if it was the inspiration for the "Yellow Submarine" ? His answer clears this one up:
mail@modelluboot.de
May 22, 2020, 5:12 PM (5 days ago)
to me
"Hello
Am 22. Mai 2020 um 12:43 schrieb R D Forrest <rdforrest1@googlemail.com>:
"Your question:The submarine does have interesting lines (whoever designed the Beatle's "Yellow Submarine" must have had it mind."
The submarine the Beatles had visited before writing their famous lyrics was the Perry Cubmarine. "

This was my first try on this sub:

And finally my actual (Toy-) version of YS:

mail@modelluboot.de
May 22, 2020, 5:12 PM (5 days ago)
to me
"Hello
Am 22. Mai 2020 um 12:43 schrieb R D Forrest <rdforrest1@googlemail.com>:
"Your question:The submarine does have interesting lines (whoever designed the Beatle's "Yellow Submarine" must have had it mind."
The submarine the Beatles had visited before writing their famous lyrics was the Perry Cubmarine. "

This was my first try on this sub:

And finally my actual (Toy-) version of YS:

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