Interesting replies, thanks. The weight, right now, is mostly in the back - I intend to add a front rack and removable basket, but right now there are only the Wald folding baskets on the rear rack. There are fenders, but they're really light. The stem extender and trekking bars probably add some weight, but not much.
And no, it won't steer straight if I try to push it along from the seat. It seems to pull to the left. I'll take a look and see if anything's rubbing.