I had a long conversation last Sunday with Don at Head Hog. He returned my call on a Sunday so that alone shows he cares. Anyways.......he is a wealth of knowledge with regards to metallurgy and the welding of exotic materials and dissimilar metals. I was very impressed and sent him a 1930 engine case to repair. If anyone cares I will report back how it comes out. In the mean time, he too has several examples of his work on his website.
Got the engine case back a couple of weeks ago and was impressed with Don's work. A little more than what he quoted, but good work nonetheless. I'm sure he'd be more challanged with something you described than just filling and re-tapping a small hole as in my case, but I'm planning on sending him more work in the near future.