I made two more tube plates for experimental dekatron cell. 

From left to right

• BCD-to-BIN coder unit
• 6-channel voltage stabilizer unit
• Dekatron unit with BIN-to-BCD coder and carry output
• [Required to build] Write amplifiers and level shifters unit

Now, 3U crate look like this. But I need to re-drill the rail holes to give the modules more space between each other. On the back, coolers, transformers and rectifiers would be added.