Go for the ice calculations. I have a worksheet with basic values of global ice volume, ocean volume, volume of ice to volume of water. One of these days I will crunch numbers to see how many inches that the sea level will rise if the ice melts. If the fear factor squad wants to worry about sea level change, I have a suggestion. Pump salt water into the Sahara Desert / northern Africa and create a salt brine shrimp fishery. Novel fish farming, food, employment. The Great Salt Lake has / had a brine shrimp fishery but I don't know the current status.
Sea level is a relative value. When the lithosphere is pushed towards the forebulges, land rises. Years ago, IIRC the NOAA ship Davidson did coring work in the Bering straight. They pulled up grasses, sedges, pollen, insect exoskeletons which are normal land types. They needed to go deeper. The value of 425' sea level change is suspect. Did they calculate forebulge movement?
I am not following your 60,000' comment. Was that a typo? 11,000' perhaps.
It does not snow in the interior of Antarctica. That is a good example of terrain-altitude weather activity. If snow does not occur in the interior of Antarctica, where did all that ice come from?
The ice sheets did not 'crush' the mountains. The crust flexes under weight and moves viscoelastic lithosphere material away from the load point. With the load gone, lithosphere material seeks equilibrium and the mountain altitude changes. Mountains were formed from lithosphere pressure to the crust. A good exercise would be to examine altitude changes of Mt. Everest, Denali and Mt. Rainier. There are sea shells at the top of Everest.
The debate about land travelers across Beringia ( both ways ) rages on and we have not got to the 'travel by boat' debates.