The tube and dowel is great for aligning the pieces together, but a recommend fixating it with pins.
Those fuse sides get really slippery and tend to move a bit... I use wood glue.

Next time in the hobby store I recommend you to pick up a Dubro 8oz fuel tank and a pair of good 3" foam wheels.
I also changed the elev pushrod to Sullivan hardware and went for metal clevises everywhere, but that's a personal preference.