Hi again Jantomo, glad to here it's coming together.
The quickest would appear to be head South on 101 and cross the bay on the J Arthur Young fwy [92] and get on the I-580 East untill you get to SR 132 to Modesto. At Modesto take SR 99 to Merced and then CA 140 to Mariposa and Midpines.but still havent got my head round getting from the SF airport to the Yosemite Bug. Looks like there could be 2 routes. Which is recommended?
I look forward to the next round of planning ;-) Have fun!