Bill , that's a nice pice of equipment you have made ,
I'll be 57 shortly , and yes I to feel all the weight , including buckets ,
As far as angles I always let the material dictate the angles needed ,
I have a Thompson dry washer and mostly use my trammel as a 1/4 " classifier , I cam move a lot more dirt and faster that way , Hauled 40 gallons by hand 1/8 mile once to a site to us my trammel . The water went fast , in a couple hours , after that I felt it was not worth using water unless I was on water be it a creek , river or lake , So I done some modifications to the trammel .
I works wonders now , wet or dry ,