Before all, thank you for your amazing support !!!!
waterwingz ,
1. Shot triggering. - What is A/D channel remote ? if I used Canon A2500 with Li battery could I used is ? I heard about SDM , what can I get using SDM ?
2. Image handling. Planning to use 25 cameras at first (still it is Hugh investment ) , shall I need Raspberry Pi' for 25 cams ?
3. Power. - I went with A1400 because i am planning to use external power supply for power up the cameras
4. Start up. - for now it will be manual

Do u have code for 1 /2/4 ?
I contact Marcus Meissner , he told me tht tat the moment gPhoto downsnt support my goal using Canon A1400 , so it looks like I will use CHDK , CHDK PTP
Is multicam.lua part of CHDK PTP?
Regards