I am a long time lurker but I check in here a lot and just noticed your post. Many thanks to the Whitney Zone community for all of the information, updates and entertaining trip reports.

Like others have said it's definitely do-able.

I did a similar route last weekend, except I went to Upper Boy Scout Lake instead of Guitar Lake, and went the opposite direction. Here's a map of my route:

[img:left][/img]

I'm not sure if it is appropriate to add a link but it may be easier than posting the whole thing; If you are interested I did a trip report with route details, photos, gear list and maps here:

http://seatosummitultralight.blogspot.com/2016/09/mt-whitney-mt-langley-weekend-september.html

Thanks again WhitneyZone thanks