It takes one 2x2 for the top and one for the bottom and then one more 1/4" of a 2x2 usually in an accent piece. each piece is 1/2" thick.
Since the solid colors still have dye lots it is best to use all 4 pieces from one together for the top and all of the pieces from another from the bottom then the accent for the middle.
It is important especially for solid colors to have about a 600 g finish. any rougher and the seam will show up as white.
I stack the pieces front to back front to back etc...
The backs sometimes have a bumpy surface and this needs to be rubbed on a 600 g sand paper until totally smooth. The fronts sometimes are actually too slick and so I have been using 600g on the fronts also.
I then used denatured alcohol to clean the surfaces and medium CA glue with gloves on to glue the pieces together.
Glue 2 pieces at a time ONLY and use clamps. Then continue ONLY having ONE wet seam at a time.
I AM ADDING THIS TO THE INSTRUCTIONS. I FORGOT TO SAY THAT AFTER ALL THE PIECES ARE GLUED AND DRIED I TURN THE FLAT SIDE TO THE FENCE ON MY TABLE SAW AND TRIM THE BLANK TO 3/4". THIS IS NOT NECESSARY BUT MAKES IT EASIER TO LINE UP THE BLANK FOR DRILLING
I like to leave then dry overnight before using.
I use 5 minute epoxy to glue in the brass tubes. After turning the blanks, champher the inside of the brass tube. I use a counter sink I keep just for corian blanks.
This helps because like Tru Stone, Corian does not move and this help ease the pen parts together.
I hope I answered all your questions. Feel free to e-mail me if you have any other.
Alice