Paul. I like your approach to your shelf benchwork. My layout was designed by cloud watching. Wet thumb planning made for a need to bump out all around the layout in many places. It is primarily a collision of left over stuff from my benchwork contracting. You will be able to install bump outs and make them seem to be a seam less part of the layout.
I could provide a couple dozen of top and bottom views to give you an idea of at least my way of doing things. Not too sure about loading this thread up . Sometime folks complain.
Contact me via my profile and I can share lots of photos. I could also talk you through some of the approaches.
There was this initial three track bumpout which needed a bumpout on a bump out for a TT.
And this free standing coal dock mock up of a finger to be added to an existing pike.
Small inside corner bump out and station bump out:
Taped scrap on feather ends to protect while in transit.
I see you are in PA. Any where near Delaware County?