FIRE WALL!!! Very important!! I have seen wood glue used and work but I have seen it fail more often. Use epoxy. Get a box of round tooth picks for your shop, that's a life time supply! After the fire wall is installed and you have used angle stock behind it to reinforce it, drilling tooth pick size holes through the fuse and fire wall sides then cutting off the tips of some tooth picks and gluing then through the fuse and fire wall adds a bit more strength. Not a bad idea for a trainer due to some of the landings it's going to see. I like to use a bit of thick CA for the tooth picks. I usually have at least a one ounce bottle of thick on hand. It cures slow enough to have many uses.
Bill, if you have a Dollar Store near you then a trip is in order. Go through with airplanes on your mind. Flight box tools are just one item. A couple of weeks ago I found a bubble level with 5 small levels in it, had to have one of those!! You will find a three pack of small tubes of CA, perfect for your flight box!! Use and toss so the tube doesn't leak!
Back to that level, I took it apart, the little bubble levels are now used for setting up CGs on new builds. They are perfect for this.
Later on your going to be asking for info on setting up the control throws, I will show you how to make your own degree throw meters that are sold for $25.00 a piece. I usually have about 6 on hand, even have one in my van for field use. Way easy to make! Free is always a good thing! I make them from scrap I have during a build. Used to sell them for 10 bucks at the field for a bit of lunch money.
Gene