The lacing is the same as any three-cross wheel. These small diameter, wide rims are awfully imprecise, so there is a limit how true they can be gotten.
this is an awesome bike, Tater! i signed up for ratrod just to ask how you did it. would you mind sharing details of your build? what wheel/fork did you use for the conversion?
These for the kids or can an adult fit them ok? we have those mongoose fattys on 20s here in the UK and if one comes up cheap I would love to build one of these up like this they look great!