just edited the post for the pics...didnt show up first time.
umm no i'll be sticking with 2wd for the time being.
i was growing sick of sending too much power to the front wheels and with a tight little track like we have 2wd might actually help in the corners

looks like it wont be very hard to go 4x4 though but i'll need an extra bearing i reckon (and the shaft will need a little modding.)