Bonuses are included in income if they are received regularly.  I'm thinking the judge would simply average the previous 12 months of bonuses and average that to a monthly figure.  I've seen it done a bunch of different ways, but I think the annual average is probably the most fair to everyone.  Keep in mind your income won't really make much difference - it's pretty much based on the father's income.

The new extraordinary expenses section of the guidelines was really implemented for things which are outside the norm for a typical family.  Competitive sports are very common and so is the travel.  If you'd like to ask the judge for it, the method you have proposed is exactly how I would do it.  There's really no way to argue that method isn't fair to both parties.  But, it could be argued that those expenses are already included in the basic child support amount.