In 2006 I fabricated the X-90 trailer.
I kept the left over tubing and I am going to use it for this bike. It is 304 prepolished stainless steel.
I dug out my old tubing bender and proceded to make up the frame tubes.
The plans call for the neck to be made from the same tubing as the frame. I thought that it would be better to make my own frame neck with bearings in it.
I grabbed a chunk of 304SS scrap out of the bin and chucked it up in the lathe. After drilling the center hole, I counterbored the ends for the bearings.
Since the tubing is all prepolished I had to buff the neck tube too.
I assembled and tack welded the frame on my lay-out table. You can really get a nice size comparison in this photo.
Here is an article and photos of a completed Tom Thumb bike. http://www.oldminibikes.com/forum/proje ... -mini.html