This is a good price, and a nice plane.
For using it, I think one move the plane at 45-deg,
not with, not across, but 45-deg.
It is used for quick removal, both surface and edge,
say, you want a quick 1/4" off the edge of a 1"
board, this plane will do the job quickly.
As for the camber, you can try a CD-ROM as the
template.
I have a #40, earlier type (for definition, check
out the B&G), and I found that I cannot clamp
the blade tight enough to keep it from move
back.
I have a woodie converted (mouth opened,
blade cambered, and better iron, simply sharper,
and hold an edge longer), even if it got some
rough edge with the plane, I like this handmade
woodie one more.
Well, hope you enjoy using this, now you can
start getting rough-sawn lumber...