My building suggestions for the Lil' Augie...

Trim the alignment guides a tad at the body tube/fin joint to prevent yourself from accidentally gluing the guides to the body tube/fin.

Reinforce the forward and aft edges of all the body tubes (and coupler) with super thin CA glue to prevent damage from the handling they'll get (as well as from hard landings).

I'd suggest "clipping" the rear of the inner fins to help to allow the assembly to slide into the shroud ... OR only pull the assembly from the back of the shroud and slide it forward into place. For my Augie, I sanded a small bit from the rear tip to allow me to do that without catching the edge of the shroud and damaging it.

To reduce the need for painting the interior of the shroud, perhaps using some aluminum tape, or Trim Monokote (perhaps black or chrome). Something on the line of 1/2 inch to 1 inch wide to just to cover the bare cardboard.

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Dreaming of making the rockets I dreamed of as a kid (and then some).

"The Guide says there is an art to flying", said Ford, "or rather a knack."
"The knack lies in learning how to throw yourself at the ground and miss."

Launching is Optional... Landing? That Depends on Trees.