Benchwork and roadbed

Invis-a-Mount
Does anyone remember these plastic fixtures that had a vertical oval column that stuck up thru the plywood deck from the bottom,....for adapting Peco turnout solenoids underneath the plywood deck vs directly attached to the bottom of the switch's ties ??
Sub-roadbed material
I'm sure this horse is dead, but let's kick it around some more anyway!
I'm trying to figure out what material I want to use for sub-roadbed. I was planning on the celotex fiberboard I've heard many of you mention, but after reading Joe Fugate's "Make it Run Like a Dream: Trackwork", I tried a chunk of 1/2" drywall for spiking a turnout to for measure/tweaking. I was surprised how well this worked. In Joe's book, he makes a strong case for it in terms of, mostly, dimensional stability.
White/Yellow / Carpenters Glue on pink foam
can anyone comment on how well white / Yellow / carpenters glue will hold to pink foam -- Im hopefully going to be laying cork sub roadbed on my new layout in the next couple days -- David Popp on MRVP uses wood glue but he is gluing to plywood deck rather than the pink foam, so I dont know if it will work out
TIM
Plastic on pink foam
Hi Guys -- do I need to peel the plastic off hte pink foam before I paint or start putting down ground cover?
TIM
Inputs sought on layout geometry
I need some added brain power on my layout design. It's based loosely on 1940-1963 Florida East Coast RR. I have in mind:

Modelrailroadbenchwork.com is still operational.
I have received a few emails asking if I'm still working / in business during this COVID thing referencing MRH as their info source. In a word, Yes. The only changes are I am not doing any in person contacts and my supplier for wheels is out. I'm otherwise 100% operational and honestly busier than ever. I'll also be having a sale soon but I have to finish custom layout #61 first.
OnDrew
ModelRailroadBenchwork.com
Plywood, Cork and Track or Plywood, foam, Cork and track
HI Folks:
Hopefully going to start cutting wood and building in the next day or 2, and I have been wondering if cork roadbed on directly on the 1/2 inch plywood or if putting 1 inch of pink foam under it first (allowing me to carve creeks and rivers and other depressions is the way to go.
Ive in my other thread about cork / homosate ive gotten a variety of opinions, and I've decided that Homosate is out for sure, but I'm curious about using foam, and how to secure track if I do?
Thanks
TIM
Transitioning through decks
I'm currently in the process of building a layout loosely based on the INT Roaring Fork Sub featured on Appalachian Model Railroading. I've included the track plan for reference:
My question is: How do I transition the spline road bed between levels? The "no-lix" design moves from one level to the next at Point C on the right side of the plan.

DO NOT USE Loctite Power Grab
Don't let the words encourage you. I have found over all my years that track, structures, etc. DO NOT need glue strong enough to withstand a Category 5 hurricane. This stuff is probably great for gluing all kinds of things, but not model railroad roadbed nor track.
This Power Grab construction adhesive made by Loctite is something that should probably NEVER find its' way onto your layout.
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