Ultimate Breadboard2 Parts Alpha

A few years back I made this baby: http://www.amateurengineer.com/?p=400. While it was nice to wokl with it was very unflexible so I decided to dismantle the old parts and remakre its elements as stackable modules. So here you go.
To see if you like I recomed printing a base_bottom with a length of 1 and one base_top.stl - its a prepared top to hold 10 banana-sockets for interconnect stuff.
If you have any idaeas for new modules pls comment!
**Modules**
**Arduino:**
Parts needed
- 2 distance bolts
- 4 fitting screws
- Arduino
Use: Just to have a fixed Arduino
**DUAL_DVM**
- 2 of those cheap, chinese made mini DVMs (ebay, 3€ a piece)
- 4 2mm screws to fit to bottom
- 6 pegnails to fit to cables
- some length of shrinkwrap
Use:Have two simple DVMs at hand
**CCCP_AVM**
- 1 beautiful CCCP Analog Voltmeter
- 2 banana sockets
- some wire
Use: Thought more of as an example on how to do it since this VMs are made of unobtainium :(
**HD44780**
- 1 HD4