Semroc Baby Orion Build Part 2 Engine Mount

First up in the instructions are sanding the laser cut fins.

Nothing out of the ordinary here, just be careful when rounding the tank standoffs. The balsa grain runs parallel to the short leading edge.
It'd be easy to break the balsa.

On this Baby Orion, there is no nozzle on the engine mount.
I decided to add one.
After making it I understand why Semroc left it off this smaller version.

I used the shroud generator on Payloadbay.com.
Enlarge the picture to see the measurements I used.

The first picture shows a dry fit of the engine mount as built in the instructions.
I knew the lower centering ring would have to be glued much higher on the mount for the shroud to work. Check the original Centuri Orion plans to see how the shroud fit on the 18mm mount.

The picture to the left shows the lower centering ring placement to accommodate the 7/8" high nozzle shroud.

Is this an exact downscale on the shroud? No, but it's close enough.