I combined the tail fin and tail fin support pieces and extended the tail fin down to be flush with the bottom of the small tail fin support pieces.

If you use this piece the middle round rocket cylinder will not be raised a bit like the real model. It will be even with the larger round outer tail support. The middle rocket cylinder could be edited to have a deeper groove so it slides farther up the tail fins and gives you that higher middle section to match the model.

The photos show how the middle round section is now lower and flush with the table.