Rocketarium Hydra Sandhawk Build Part 16, Fin Gluing

Here's the booster section ready for the gray primer filler spray.
The fin lines are masked and a piece of tape covers the vent holes from the inside.

The same was done on the upper body.
The fins are glued 3/32" from the rear of the body tube. A wrap of tape (blackened with a Sharpie) was rolled around the rear for a reference.

After the first fin was glued on, a paper wrap gave me the height for the leading edge tips.

Paper wraps were also used on the booster for height reference.

Here's how the booster was masked to keep the engine mount clean.
Masking tape pieces were stuck sticky side in around the end of the booster tube.
An engine casing on a dowel was inserted into the mount.
Paper towel pieces were stuffed in the recessed.
White undercoats followed.