Hello ! I'm french so, I'm sorry for my mistakes! I want to do the micro and the battery box but in France, the MCE-2000 is unavailable, but the MCE-4000 is (http://www.audiophonics.fr/capsule-micro-electret-panasonic-mce-4000-p-1038.html?osCsid=2aa2efc895d92429bd57031c03b45536). So, can I make the micro with MCE-2000 capsules ? Thank you!