That's what i wanted to hear!
My plans is basically exactly as Paul suggests, (and Iand), The rear wheel looks as though it will fit a 30mmOD bearing nicely. although i can get a 30mm OD bearing to suit a 17mm shaft, they are quite expensive, (and a little harder to get). the 12mm shaft are easy, and cheap

.
All i really need is a spacer between them, piece of cake.
The only issue i can forsee is softening the high tensile at the weld.
I'll give it a shot and post the results.
Thanks