I modified the bottom section to have a flange to make for eaisier mounting to any flat surface, i wired the usb ports together with a wire called bus wire it is commonly used for solar panel assembly makes jobs like this super easy, i also had to increase the amount of clearance for the USB ports as the original file generation was still .2mm shy when printed on my printer. (i use a 1mm Nozzle.) i included my flange base and my 10 port holder.
heres a link to some cheap bus wire http://www.ebay.com/itm/2mA-5mm-x-0-2mm-Solar-PV-Solder-Ribbon-Bus-Bar-Welding-Wire-Metal-/282599019726
on my printer slower is better but the 1mm nozzle makes up for the time...