Just watched the TV Programme. Very interesting. I thought the following may be of interest.
I bought what was then said to be a kit of this sub on my first visit to Japan in 1960 (aged 16 yrs) and built it on the trip from Osaka to Madras and back to Kawasaki via Penang.
The kit was two plans (In Japanese) and some part shaped chunks of wood in a paper carton. The motor, shaft, guns, rails etc. were all purchased separately in model shops and department stores. They had a wonderful selection of boat bits in an amazing number of sizes (no scales given, just get something that looks right). I have never seen a selection like that since. Shame.
I gave the model to my Dad on my return home and we sailed it a few times on the paddling pool at Bridlington. Last year I retrieved it from his loft after his demise but only found one sheet of the plans which gives the put together part. The dimensions and cutting sheet is missing. From the plan I see that this is said to be I-401. Quite why I put 141 on the conning tower is lost in the midsts of time!!!
Here are a few pics of the boat as is now. Bits missing and a funny gun on the after end of the conning tower.
I have split the pics into two lots.
John