Westcoast - I've never been to Aspen. I take some of blubbers' stories with a huge grain of salt. But you're big on credibility so how can you say the mountains are 14,000 when the topo map shows the distance on a 2 mile left base to be closer to 8800' (+/-)?
Mayflower Mine, CO - N39.19974° W106.87182°
So it's not a 6000' AGL base turn like you're alleging. It could be as low as 800' (+/-). Suddenly it's not the impossible event you're trying to make it out to be.
Would I recommend a left base? Absolutely not from looking at the pictures, charts, and topo charts. Why would someone fly that? IDK. But here's the flipside - does it look impossible? No, it looks possible. Dumb maybe but maybe not impossible.