Great looking build - I'm a bit concerned about those LEDs though - the packet says 20mA 3-12V which does not make sense unless each has a built-in regulator that will deliver the 20mA over that range. I suspect they may just have prewired resistors, but those will only give you the 20mA for a specific voltage, not a wide range like that. It may be they are prewired to give 20mA at 12v which is fine, but any voltage under that you won't be getting full brightness. If they a prewired for 3v, then applying 12V will massively overpower them. Somewhere in between may initially "look OK" but still could be driving the LEDs to a very early grave.... I'd hate for them to start dying once they were all sealed up in the model!