Thanks for all the comments, I totally enjoy doing these.  
Yeah, my labor rate would not support a habit at Starbucks
Ducky, I didn't even start this project until I conferred with several MIT grads and I did have 2 professors stop during construction just to guide me.  I've been assured it will 'serve' somebody well into the future.  Yes, I have a tub that's 
19 1/2" x 11 1/2" and a couple inches deep.  I cut my plywood to 19'x 11' to allow a comfortable border and lay it in using my keen sense of dimension thus giving it a neat yet uneven border which fits the overall appearance.  I do trim both long edges then square the ends to that edge.  I use a 1/8" white side round over then ros the entire piece paying close attention to the cut edges to assure the saw marks disappear then apply my poly finish
damn, I think I just gave a short tutorial -  look what you've done to me ducky