Here is an idea which I used on a caboose roof where I removed the copula I was splicing two Flyer cabooses together to make a long "Drovers caboose" and I did not need one of the copulas. After I cut the second copula off it left a hole in the roof so I took a big chunk of modeling clay heated it and formed it around the roof where the original roof was uncut. This gives a perfect form of the roof however you cannot pull it off yet. You must put the car and clay mold in your freezer overnight and the clay will get stiff enough to remove without deforming it helps if you can embed something like big nails in the clay to stiffen it up before you freeze it. You want the mold to be as thick as possible. Once it is thoroughly frozen you will work it off the roof very gently so as to not warp it in the removal process. Now you reposition it where you need the repair and press it in enough to seal around the edges. Now from the bottom fill the area to be repaired with epoxy and let cure. This process does call for you to drill holes so you can fill from the bottom. No doubt the grooves in the roof will make this process a little more difficult but it will work never the less. When the car and clay are removed from the freezer water will condense on the surfaces you still want to get the clay mold positioned before it warms. Once in position just turn the car and mold upside down and let them dry before trying to fill with epoxy. I would try a practice run on something other than your nice dome car before fixing it. j
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