they arent too hard to do really
all you need is a shallow offset disc so then u are able to make a flat plate that can bolt through the drum backing plate bolts
i have seen several laser type setups but the last one got the offset correct by using 200B hubs i think
i personally have put silvia setup on one but that was a heavy conversion and complicated as the disc offset was large.
currently i am finishing up a wilwood race type setup which worked out really well apart from the wheel to caliper clearance
all the pics are in the yahoo group and being a 1000 guy u should join cos its tumbleweed over there
http://groups.yahoo.com/group/datsunb10/all the pics of what i have done are in the bennys thou folder
there is also a nice conversion that dattoman is selling and it is on his website
http://members.iinet.net.au/~dattoman_1000/index.htmits all there too and he should join the yahoo group and more importantly my msn as i bet i can help him out
u are of course welcome to hassle me on msn too
blue510fj@hotmail.com is the email to find me on for msn
you can message me here too if you would like
ben