Martin, the second side will go quicker.
Just spend more time with the sanding process, it pays off!
Most of your time gets spent on the cast part, start off with 80 grit and go until you see the little cast pits disappear!
Then start your grit steps with the sand paper to get the sanding marks out, go all the way until your into 400 or 600 grit, then bring on the.....polisher.
Rarely does anybody get on thier knees to look how good you done the swingarm, just get a descent shine cause you'll probably want to hit it again this coming winter.
Chrome wheels and a polished frame are usually the main topic's of discussion when your bike is getting looked at.
When My friends with red/silver Busa's come over, your Bikes one of the first I show them for a reference. (that should help you get the frame finished)