@StPaul posted:well my first thought is remove that 1" thick foam sheet and use a 1/4" foam. it might be helpful if you could post a photo of area so others can see area as it is now and come up with a plan to help you. other thought is to replace that 3/4 plywood with a 1/2" piece best I can offer others may have better choices for you.
Thanks - like I said, there were other considerations that had to be first taken into account in arriving at the use of 3/4" plywood and 1" foam in building this part of the layout and the "given" is that it cannot be changed - no how, no way.
The only question is how best to work around the 1.5" versus 1.75" differential and recessing the TT mounting tab locations by 1/4" deep seems to be a viable solution - just seeing if anyone on the Forum might have a different take on it.
Pics of pre and post Roundhouse installation - the pink circle is approximately where the TT will go.
