customizable frame (updated!)

This easy to assemble frame (please suggest other words) consists of 4 pieces.
When using finger joint, the design is laser-cut friendly (take material width into consideration).

This is a work-in-progress with many potential uses and quite honestly just a by-product of something else I am working on.

//Update July 25
Added dovetail joint alternative

To do:
* make size and amount of notches customizable
* add additional notches for inserting dividers etc
* design semi-controllable divider layouts
* even more joint types?

Other suggestions are most welcome.