Since you'll be staying at Gourd and Crater Lakes, it sounds like your friend is planning a variation of the Indian Peaks Northern Loop in a counterclockwise direction. Here's a post from the early days of my blog to give you some idea of what it will look like.
If you're not used to it, the altitude can get to you, so if you don't make it to Gourd Lake, no sweat, there are plenty of good places to camp in Fox Park on the western side of Buchanan Pass.
Here's a forecast for Crater Lake for the coming week to give you an idea of the lows and highs and possible precipitation. If the weather holds, I would probably use a similar kit to the one pictured in the post. Since the campsites at Crater Lake are designated and the ground is hard, your UL7 is a good idea. And I would substitute a canister stove for the Caldera Cone because of the high fire danger this year.
And be careful of the last few yards approaching Buchanan Pass. Snow can get trapped there, and if you slip, it's a long way down.