chip amp, BMS,bluetooth, PCB, audio sound guitar device

Hello I need to create audio device with tda1562 chip{or you can suggest somethin better say with transistor and dc dc converter} BY BIDDING ON THIS PROJECT YOU AGREE WITH MINE STATEMENT THAT I WON`T PAY FOR PARTIAL PROJECT, BID ACCORDINGLY, READ CAREFULLY I require engineer to communicate on skype at least every 2days TDA1562 amp module with battery management system, with bass, treble regulation, IN input with volume potentiometer for line in level, switchable with switch for guitar/mic input, bluetooth module for receiving signal, say from mobile phone the amp package would be affixed to Aluminum cover, board would be affixed to this also, 150mm wide, 120mm long these are limits of the board on the amp input there is subsonic filter of 24db,adjustable from 40-70hz this would be complete system, when +12v would be present on the input, charging would start and batteries themself would be disconeected from the rest of the system so external power would at that time supply amplifier itself and also charging of the batteries charging would be done individually, each of 4 batts have it`s own dc dc converter{mp2307 modules i would provide} that would convert power from 12v to 4,25V to provide sufficient I so batteries would be charged soon every battery requires somethin like comparator that would take care about the fact when battery would reach 4,17v charing would be terminated, and would be repeated only in case voltage of battery would run down to 3.90V when batteries are being charged, it is necessary to disconnect one from other one...relay is most simple solution, still i would prefer transistor batteries voltage can be measured by 3diodes, low , med , high , light up voltage have to adjustable because there is possiblity battery system would be 3 and /or also 4cell amplifier has dc dc converterer to provide sufficient voltage all the time, it would step up{convertere provided by me} voltage to 17,5V due to charging, switching etc. when audio is turned on, amp needs to wait before it would be switched on{or speaker would be connected later on} to avoid bad sounds