Great job on the cigar!
A long time ago I got confused while making one and screwed up the order of the bushings/tubes.
The size of the bushings is close on some of the matching pieces and the tubes are also close in lenght to each other.
With those variables in mind I made up a way of remebering where each goes.
The tube that takes the nib is longer so starting with the nib end (Out of habit I put the nib at the headstock but the larger piece should go at the tail stock I suppose)
From the nib end the order of the bushings are:
Smallest, second biggest, biggest, second smallest
The sceond smallest being the bushing for the finial.