I recall reading someone using 1/350 railings on the kit and that they didn't look terribly out of place. The kit did furnish a decent start point for an effort to dress it up.
Now that Black Cat is offering 2 versions of the Butler class then it might be worthwhile to save the effort on the Lindberg for a more worthy endeavour.
Gold Medal Models (Loren Perry) closed his business down this last year. .
It was taken over by Squadron mail order. I surfed to their stite and these was no photo etch listed for the Lindberg 1/300 Delong DE or of 1/300 railing in general.
I hope somebody can prove me wrong in the availability D elong 's photo etch. It's a fair kit and now there is enough after market to make a fair build.