Thanks! I really appreciate the time you took to answer my questions. I do have one more question...I would expect that you would want to do 3-5 cardio sessions per week. Remember, though, that "cardio" and "aerobic" or not the same thing. As a DH racer I would recommend that you focus more on your anaerobic conditioning as it will be of more benefit to you. There would be 1-2 steady state aerobic sessions for active recovery as part of the cardio training.
Prioritizing compound vs. unilateral exercises has no perfect answer but I would say that if you are just starting out I would prioritize the unilateral stuff for the first year or so of training (as in 70%-30%). Even if you had your unilateral strength built up I would still have it at least 50/50. Riding takes place one leg at a time for the most part and some strength coaches (like Mike Boyle) have their athletes using a heavy dose of unilateral leg work at all times. In addtion to the more functional strength they build there is also the added benefit of less wear and tear on the body since you can only use roughly half the weight you would on a bilateral version while still providing the same load to the limb. I do think that you need bilateral exercises like front squats and deadlifts, but mainly to get your body used to being under heavy loads and the nuerological results that produces.
As for complexes, I obviously like them since I wrote and posted an article on them . I like to use them to switch things up for conditioning. You have to look at the work to rest ratio to get an idea of how to incorporate them. I like to try and get a 1:1 ration (1 minute of work to 1 minute of rest) going with the complexes as this mimics a lot of the intervals I like to do with people.
I know there is some vaguness here but if you have some more specific questions based on these answers let me know.
Do you think it's worthwhile to build up the work portion of your interval training to be about equal to your average DH run time. IOW, if my average DH run time is 5 minutes, should I strive to have 5 minute work periods in my interval training? I'm thinking that's a bit harsh, and doing multiple shorter (but still intense) intervals will suffice.
Again, thanks for taking the time!