Good reasoning Harry. Along with others- what you are most comfortable with. Each one woiuld hold in your case. A good glue-up goes a long way.
Seems your next question is on the joining of the corners. From s structural point of perspective... You drew out the ends as a frame and panels... You didn't post a scetch on the front/back/bottom. So from a guestamation of what that might be... I'm assuming that the grain of the sides and bottom is going horizontally, with the ends meeting the sides(?) Are the ends inside of that frame on the ends or are there panels inside the frame as the sides? Wondering if you thought you would miter lock those frames to the front or to side panels that are inside of those side frames?
If was looking at your sketches and pondering. A miter-lock might not what I would use on those corners into an end frame. It would detract from the design. I would think a spline joint (either with your table saw or a router.) The grooves would be in the ends, with the splines in the ends of the front, back and bottom. The bottom in chests like that are usually fitted into grooves between the front and back. On adding more to that kind of joining, if I want more than just glue, then I'll shoot some 16 gauge finish nails in. If I think I need more... then I'll use trim screws and sink them below the surface, where I can either fill over them... or put small wooden plugs over them (about 1/8" holes with trim head screws).
Maybe I sometime take some of those things for granted, because I've been doing it a while. I know that may sound like a 3-D puzzle. But plan them out and they just snap together quickly. Joining in that manner, each joint works together to hold the whole together. Being off a little when you set up your tooling and it is a little forgiving and doesn't detract from the finished product.
Being off a minute amount on one end of one side of four locking miter joints... and you have more work ahead to cover that up from showing.
But when it comes down to it-- I guess all of that really depends on "your design"" and/or what you want to practice on. I know whatever path you take, you have a tendency to do a good job at it. You want to do a good job. You take pride in what you do, but sometimes have to remember that it just needs to meet your standards and sometimes your own standards are pretty high up there. Don't take it too seriously or critical. Remember to have fun.
"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."
Last edited by MAFoElffen; 06-26-2014 at 04:02 AM.