I am interested in this useful product, but would like some clarification please before sending email regarding my interest in the new metal cover model. If I understand correctly, the metal cover will be thinner than the plastic cover which is for the Mugen extended battery, right? So, if that's correct, the metal cover will allow me to use one SD card? Later on, you might release a (2) SD card version? With your SD adapter, I will no longer be able to use the microSD slot? Thanks for your providing this product and your help with my questions.