Yeah, it was hard, that's for sure. The most epic level of them all I think. I completed it the second time, only having 33 Units Lost. Laying mines on the ice or killing units at key points on the ice allowed me to shape pinch points that I could dominate (both at the north and the south). The top right front line was all about long range guns and tanks.
A major help was seeing your screenie above! I saw that you could take the airport at the bottom left - that made it much easier.
Then I must've build about 30 of the condors. It was eventually like shooting fish in a barrel.