This model has a standard minimum diameter engine mount.
Kevlar is tied around a notched engine block.
Glue is applied inside. The block is slid into position with an empty engine casing until 1/4" of the casing extends out the back.
The Jim Flis instructions say to use 1/8" thick balsa for the fins. That looks like it would match the fin thickness in the original black and white photograph. I didn't have any 1/8" so I went with 3/32" thick.
I figured with the printed covers the fin thickness would end up close to a 1/8" thickness. In the end, the 3/32" balsa and fin covers fit the slots in the body shroud very well.
You'll go through a lot of balsa on this one!
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