Finished proyect: UV LED light box.
I used the 1.6 litre Really Useful Box which in the UK they can be easily found at Staples.
[Dimensions: External: 195 x 135 x 110, Internal: 150 x 110 x 95 (length x width x depth in mm)]
It nicely fits the PCB designed by RaDiKalDeSiG
Also 54x 5mm UV LEDs 7000mcd from eBay