Is that based on Paul's design? If not, I'm sure we'd love it if you started your own thread with all of your build details!
Maybe I'm just paranoid, but I don't really trust solder all that well for a primary mechanical connection. If you do a new revision, I would suggest that you drill holes in that copper sheet so that you can feed the leads through before soldering. Same with Paul's power section - I didn't like how the mosfets were surface mounted to the copper.