Estes Twin Factor #7250, Build, Part 8, Rings & Fin Gluing

After the glue has dried, sand the top joint to even things out.

Here's the assembled two saucer sections, 

the tops -

And the bottoms.

This is one of those instances where I extend the fin pencil lines under the bottom of the body tube.

TIP: The trailing edge of the fins is even with the bottom of the body tube so the pencil alignment lines will be covered. With the lines drawn around and onto the base edge of the tube you can better line up the low end of the fins.

As mentioned earlier,

the upper and lower stages are identical assemblies, except for the engine block positions.

This is a dry fit - no glue yet.