Step 5: Cut the spline grooves in the trays and the frame at the same time
when you cut the actual splines use lots of trial and error. this can be a tedious step but it makes the project that much better when done correctly.
then just glue them in place and wait overnight.
after they have cured overnight use a flushcut saw to trim them flush. and then sand sand sand some more.
now you need to round over the corners on the trays and the frames. use a router and router table with a 1/2" roundover bit.
sand some more.