Two 3 1/2 inch cakes for the bottle, & one 2 inch for the cups.
The bottle was meant to be life size - I measured the diameters of the bottle of baileys & drew out the cross section on graph paper. I knew there'd be 1/2 inch of marzipan all round ( 2 layers , each 1/4 inch) so I drew a line 1/2 inch inside of my original line & that gave me the diameter of the cake I needed (i.e. 3 1/2 inches)
 

 
Cake top trimmed
I pinned greaseproof paper round as a guide & cut top of biggest cake level
 
 

 
Sides trimmed.
I turned cake over, stuck a 3 inch cake board on bottom & trimmed (electric carving knife) from edge of cake board down sides to outer bottom corner so as to slope sides- then turned cake over again & it looked like this picture.
 

Next cake added.
I stuck the smaller 3 1/2 inch cake on top, with layer of marzipan in between, then pinned a 1 1/4 inch diameter paper circle on the top (got the dimensions from my pencil drawing) & used that as a guide to angle the sided of this cake, as in picture
 

 
Pushed in a dowel
It went right to the bottom
 

 
Shaped bottom of dowel
Added marzipan at bottom of dowel and smoothed it to shape
  
  

 
First marzipan
Did the marzipan in 2 halves with vertical seam down middle cause the original bottle has a vertical seam- I used 1/4 inch spacers to get a controlled thickness when I rolled marzipan out (BIG thanks to the maestro Christine for telling me about those!) cause I knew the thickness of the final covering had to be the same as the marzipan I was painting the labels on, or the labels wouldn’t sit flush with the cake sides
 

 
More marzipan.
The bottom layer finished

 

 
Back label.
Painted it on 1/4 inch thick white marzipan, using paste colours & gold luster powder diluted in vodka.

I stuck some greaseproof paper over the real label on the original   bottle, & traced the design- then pinned that paper on top of marzipan & traced over the design again with a smooth, blunt but fine-ended "scriber" (wrong end of sewing needle held in pin-vice), which gave a lightly indented mark on the marzipan
 

 
Finished back label.
Painted & trimmed label. I wrapped it in waxed paper & it kept sufficiently moist & pliable for a couple of days. 
 
 
 
Top layer marzipan.
First half of black marzipan added
 

 
Rest of black marzipan.
2nd half of black marzipan added, plus an extra bit at the top to form the bottle cap
  

 
Back label 1.
I pinned the paper tracing of the label on to the side of the cake, & cut round it with a scalpel, & removed the top layer of marzipan
 
  

Back label 2.
The painted label stuck in to the "excavated" shape
 
 

 
Front label 1.
Excavated space for front label
 
 

 
Front label 2.
Front label added
 

Making Cups 

 
Cake for cups 1
Trimmed level
 
 

Cake for cups 2
Cut in two
 

Cake for cups 3.
Sugar paste on tops
 

 
Cake for cups 4.
Sugar paste added to sides.

The handles I made from 50/50 sugar paste & flower paste. The saucers from flower paste, left to dry on cornflower-dusted china saucers