Hi Brian
The sine vice looks OK but I prefer an angle table used in the same way as the sine table, it does not restrict the size of the part being machined like a vice does. The one I have has Tee slots and tapped holes in various places so a vice can be bolted down if required.
It was made from castings many years ago to the Dave Lammas design, I beliieve it was written up in the ME magazine. You will of course have to machine the castings so requires a milling machine to make it.
Emgee