Your toolbox looks great. I am not as far along as doing the lid yet. It took me a while to get up the courage to execute the hell tenons. I finally got the tenons done for the inner partitions, but had some difficulty with the tenons splitting. I had to redo 3 of the tenons due to splits. The split occurred across the growth rings, which run lengthwise on the tenons. I used a 1:16 ratio for the inner slopes of the mortise, and a 1:32 slope for the wedges. I think my wedges may have been a bit too fat and caused the split.
Experiments with an "open" mortise.
![Image](https://lh3.googleusercontent.com/-z8aL4nDvsVg/T5d6N8N0LDI/AAAAAAAAAOE/5BghT9Yq1po/s1200/DSCF3726.jpg)
The splits...
![Image](https://lh6.googleusercontent.com/-yikoDanby0c/T5d21OQyZ9I/AAAAAAAAANo/Rr6DgVLqBO4/s1200/DSCF3735.jpg)
Finished partitions
![Image](https://lh5.googleusercontent.com/-aHTxrAJyQdo/T5d23X7o75I/AAAAAAAAANw/fl9yQ8Siuuo/s1200/DSCF3734.jpg)