Hatty

Velcro is a great way to attach things, especially the battery since you will probably be taking it off the plane often. I wouldn't rely on the adhesive to keep the velcro attached to the plane. Ive seen many people cut 2 slits in the fuselage and feed the velcro strap through them. Whatever you do, make sure there is a hard connection and not just adhesive. This method also works well for the receiver and esc, but not for the motor. I'm not familiar with those mounting methods, but take a look at the photo gallery and you will get ideas on how to do what you're asking.

The plane is a simple build so you shouldn't have any problems. Just make sure you have all the measurements correct before you start gluing. Extra time spend in the build will prevent many headaches when you fly it.