There should be no construction on weekends, according to the info the USFS put out.
That doesn't look too bad to ride up. But parking at the end may be limited.
(also the official road plan includes a bike lane!)
I'd be ok with not riding the last part of upper Rock Creek and making up that elevation by going to the top of Death Valley rd
on sunday, or doing Gorge rd on the other side of 395 (like in 2007) before Rock Creek, or going to Lake Sabrina (also like 2007) in addition to South Lake.
I sent a message to Steve asking if it'd be a good idea for some of us to contact the Forest Service people, to politely let them know that real citizens (who spend money in Bishop) want to do the race. I know from when I worked for the FS that they may ***** in the office when members of the public pester them but it does get their attention.