Update

The long anticipated 20" x 4" rims have arrived!  Having a full rolling chassis is quickly approaching.  Tomorrow I will be lacing up the 2 bitex 20mm hubs and the 2 rear wheels to new rims.  Luckily everything is 36 hole so this shouldn't be too difficult.  I think the only issue we might have is determining the correct spoke length for the 2 different hubs.  I will have more photos to add after this weekend!  For now, here's a picture of the head tube welded onto the front frame.