I know there are lots of folks out there who have done the Allis G electric tractor and it is really well documented elsewhere. If there are farm hack members with experience with this conversion, or interested in building an open source "G like" tractor I would be really interested to jump in. Ben, you have the allis G sketchup files right? I think that together we could probably put together enough information for the start of a good tool wiki on the topic. We could then do some sub-tool wikis for G-type implements like the various tine weeding approaches etc.