Now let's go back to the original question.
And the original answer.
I put it to you Milud that as the owner of said kit he can do what he pleases with it.
Indeed he can use slimline tubes for all I care, he may wish to use a slimline nib, clip, belt and hat and call it a Baron or Jnr Gent.
All these things are relative init dad?
He may want to have a bird in hand for a hapeh of tar and leap for a needle after looking in his haystack what the hell do I care, I know I have used them and may do again.