On the forum I've seen that several replacement battery compartment covers have been made to great effect. At first glance, this may look simple enough but how have you made/fabricated off-set locating lugs (usually at the bottom) and the securing/fastening clips/catches which re often flexible/'springy' in the original covers? Stock cover clips sometimes look a bit of a nightmare to refabricate in plastic, how have you overcome this? Pics please, if you can!