Modular Enclosure Frame

Saw http://www.thingiverse.com/thing:690543, nice.
Thought I could do something simpler and came up with this.
Used Tinkercad to create it.
The Frame Bar is 150mm long, 20mm square with a 10x10mm slot with a bridge for supporting the Block Connector and Corner Block Connector when joining the parts together.
If it fits tight enough then the Block Connector, which is 30mm long x 10mm square, can make it basically a "Snap fit " design.
When I have printed more and come to fit all the parts together I will most likely either Glue or Bolt it together or maybe Print some brackets.
Added a Corner Block Connector because i forgot when designing the others.
Added a 100mm Frame Bar and 50mm Frame Bar.