I have the 34" version of this model which is now over 50 years old. I refurbished her during the lockdown with accessories from SLEC.
They are a very helpful company.
From your photo I'm not sure if yours is the 46" version of this model in which case I'm not sure where you can get accessories from but I'm sure someone on this site will be able to help!
On this site mturpin013 has created a blog of his build of the larger model - it is superb especially with the feature he has incorporated for displaying the model :-
Scroll down to the section entitled 'The End' to see all the detailed photos - especially with the hatches raised.
Hope this helps. I've attached a photo of my 34" model on the water recently. Good luck. 😊
I'm sure he won't mind me pointing you in the direction of this blog.