Jim
The spoke rim can be a nice slide fit,on a machined shoulder,
remember the hole locations in relation to the other side are important,
if you use the freeezer oven method ,you MUST get it in the correct position,
so a slide fit will allow the wheel builder to get it right,
once the wheel spokes are laced in ,it cant move,
look at many older speedway hubs,especialy the nylon ones,
they had both sides a loose fit.
the main advantage is the brake plate fits the fork leg,and the width is right.
If you have a big lathe,it is not such a big job.
It is a long time since I did this job,
but I think you will have three holes to either weld up or put rubber grommets in,
if you look inside your standard hub you will see.in the centre wall.
Mike