Bob AZ wrote:

All steel was ordered to size. Wastage almost zero.

I used screws for assembly. Note they now have a gun that shoots
"nails" in. The nails are copper coated and the nails are effectively
welded in pace. Works like a nail gun. Only the nails are tough to
remove.

There is a site that goes along with this type of construction. A
google search should find it.

Bob AZ

can you give me a keyword?