Had a bit of time over Christmas. Here's the finished stem pressed back into the lower triple.
And here is the front end mocked up. It's assembled with the wrong top bearing, and none on the bottom, but it all fits, and looks pretty good! No clearance issues.
The factory steering stops even line up and work properly. Bearings are on order and I'm looking for a first gen SV650 rear shock if anyone has one they want to part with.