1. Glue a stick or tray to the fuse sides under the receiver and battery and use a velcro strap. Run the strap under the stick/ tray you glued in and over/around the batt and rx.
DON'T forget to check your CG before flight!

2. If you are concerned about the hinges, install a small wheel collar on the tail wheel wire on the bottom side of the tail wheel brackett and tighten it in place so that it takes the pressure off the rudder and puts it on the tail wheel bracket.

3. No cowling? No problem! Lots of different plane designs have no cowl at all and they fly just fine.

Good luck! I hope this helps.