Thanx for the thoughts ans suggestions. Im gonna likly buy an acetylene set tomorrow. Its a good excuse to buy cool tools arrr-ARRR-Arrrrrr!!!. Plan is like KJay mentioned. Im gonna braze a BA fender washer on a nut and notch it with a bandsaw then paint them with cold galvinize paint. Ill post pics on my pic account
I was looking for some screws on McMaster’s website this morning and stumbled across these large weld nuts that may possibly work for your project. It’s item 98007A029 on page 3216 of their online catalog. They say these are 1-1/2-inch diameter and only 7/32-inch thick for the 1/4-20 size or 1/8-inch thick for the 10-32 size. They are also stainless steel.
The edges look like they have squared areas that you might be able to catch and turn with a flat blade screwdriver. If not, maybe a bent tip awl or O-ring removal tool could be used in the holes to turn them instead.
Large Weld Nuts 
