looking for help and advise on finishing and repairing marbella countertops
 

I have a Marbella tub surround I am going to cut up and use as a kitchen countertop surface but I need some advise on how to properly work with it since youtube has little to no info about marbella at all and its all just about 1 1/2" thick granite slabs but I watched many of those, but again they don't give much details and its mostly about sanding and polishing.

mainly I need to know what type of epoxy to user to join the seams as well as bond 3 layers thick to the edge to create a 1 1/2" thick edge.

I also need to know what tools can or should be used to do the cutting, shaping, and edge finishing and polishing.

I will also need to know if there are any links you can give me with info to help me.

thanks in advance