Unfortunately I cannot reply directly to your message CBQ_Bill, but we have full curves in the works.
I helped build this project with Pennsy Man in his garage doing the electrical.
We purchased one of the curves and one of the straight kits when they were being sold with the wood and just duplicated them in a wood shop. We struggled with the corners as every piece in the reversible corner kit was 1/16th of an inch too long. After assembly, it was almost a quarter inch out of spec.
Unfortunately you can no longer buy the "whole" kit from the Lionel store, just the core components (leg bracket, wiring, etc) that does not include any wood.
We chose the reversible curves for the sake of material savings and portability as at the time of initial start, we only had a single long-bed pickup. We do plan to include the full curves when time and resources permit.
The track is directly attached to the tabletop. We found insulation to be a horrible chore to install, expensive, and in the environments we were operating pointless. If you were making this for personal home use, do it. Otherwise, you're just "whistle'n dixie in a nor'easter".
