What do you mean by non-XR conversion? They are both the same box aren't they?
I got very seriously into looking into doing the conversion but gave up in the end. A combination of dodgy wreckers who kept upping the price everyone time I called up and the worry that I am not going to be happy with the finished product. Gave up in the end.
Funny thing is that one of the wreckers who I was trying to buy a manual conversion kit from told me had 3 other guys interested in it so I better get in quick. I eventually decided against it and now 2-3 months later its still being advertised.
Still thinking of going back there and giving him a lower offer and saying take it or leave it. Always worth a shot I spose