Creating a marquetry rossete from scrape wood

The back ans sides for the current build are so beautiful that I decides to make a Rosette out of scrape wood left from the back. this is what I did:

I started with gathering all scrapes which left over cutting the back. I created a triangle template on a carton board and just copied it's trace on scrape wood. I watched that the triangle direction goes with the grain direction and not across

 

  

then I grouped all triangles together and clamped them in order to shape them together.

I used block plane to do so. the purpose was to make all triangles have the exact shape.

another important thing was to have all lines straight otherwise the triangles won't glue side to side.

 

  

After fitting all triangles , I used a 10 minutes epoxy glue to glue the triangle in the desired shape.
using this glue let me have enough time to glue the pieces together.

 

After gluing, I let it about an hour till I got back to the rossete and started cleaning it up from the glue waste , using a cabinet scraper

this picture was taken after cleaning it up.

Next phase is putting a double sided tape. 

This side is glued to an MDF board.

Next step is to drill a hole at the center of the Rosette circle. the center doesn't have to be accurate, since if you spared enough material on the Rosette width, the drilled hole its a pivot that will define the Rosette circle.

Next phase is going with a dremel tool + stew mac jig to cut the outer ring.

Next step is the inner ring

 

Now carefully detach the Rosette from the MDF.
If the rossete break - don't panic - it happened to me twice.
Cyanoacrylate  will fix the problem.

 

Next - is finding the pivot center-line for the Rosette on the soundboard. I painted some thin coat of lacquer on the Rosette area , in order to prevent tear off when passing on soundboard with dremel

  

Next thing is to use a knife or a chisel to spare space for the dremel router bit to start. it this hole need to be measured in order not to go too much deeper.

  

  

Working with the dremel  +stew mac jig.

  

Next phase is gluing the rosette + purfling. I used PVA glue (Titebond yellow glue)

  

  

this is how the rosette looks after scrapping and cleaning

  

and here's the final result