Thanks Becky for your interesting comment and the nice photos.
Hello friends,
BTW, after I've measured the
SRB in the last photo again more exactly, I still hit on another idea.
Make one out of two! 
I also still have a
Revell Stack from the kit and could combine its
Aft Skirt-Ring, which does not look too bad, with the
Airfix Disc.
And I would imagine that the result could well become a useful compromise.
