Hi again Jantomo, glad to here it's coming together.

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?
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.

I look forward to the next round of planning ;-) Have fun!