Had some more thoughts on the train in this morning.
* The warnings about silicone/glass/acrylic bonding don't seem to apply - the stuff I'm using seems very sturdy. Maybe due to using 3/8 plexi?
* Call glass shops for quotes on covers - 36x12 and 36x18
* Rain is preventing MTS drying and no room in the garage! Clean/re-organize the garage.