You're going to really want to double check all of your measurements before getting a set or having a set made. You could easily run into negative rake problems and cause the bike to be very very unstable. Adding rake in the trees decreases trail, adding rake to the neck increases trail. You usually wouldn't need 3-6 degrees of rake in the trees until you already have quite a bit of rake in the neck. You would then use raked trees to get the trial measurements back in line so it doesn't handle like a tank. Basically, unless your neck is already raked quite a bit, you don't want raked trees.