Finally finished the cove jig (which turned out bad) and the cross cut sled (which turned out good)
Also finally put together the prototype, made of special HD Marker Spalted Pine:
It was a good exercise. I refined the order of operations a little bit - I discovered that the arch cut into the base of the wide face is about 3/8" wider than my miter gauge. Oops! So I'll have to cut the 45's on the ends
and then jigsaw out the arches.
I also learned interesting things about falling off-cuts from the sled. I think the next sled I build will be out of 1/2" material instead of 3/4".
The coving only went ok. The back edges of the miters did not tear out as I had feared. I have coved once before and used a 24 toothflat-grind ripping blade. This time I used my 60 tooth ATB-grind crosscut blade. And it was awwwwful. I'm switching back to the 24t Rip for the finished product. I also missed on locating the cove. Turns out the proportions I have designed are very very close to being awkward. So the cove being off only 1/4" threw everything off and this box looks very top heavy.
My target coving depth was 3/8". This cove is actually just shy of 5/16" deep. I think the depth looks good, so it's nice to know I have 3/32" additional room to play with.
On the finished product, I'll try to miss the cove to the "narrow" side rather than the "wide" side. I have a couple new ideas on how to setup the jig this time around. I've also decided to run a small 45* camfer around the top of edge of the top to reduce the visual weight.
Still have not purchased the exact hardware. I'll be running this prototype up to the woodworking store to try out various hinges and clasps.