I am afraid not. No Zega Mame Boy Advance kits are supplied with a Raspberry Pi pre-soldered.
Technically yes, but you would need to install all the required drivers manually for the LCD, GPIO input and audio output yourself. I do not support 3rd party images. If there are any issues while using your own image, I'm afraid I cannot help. Why not do it the easy way and download my pre-configured image.
No, this kit will not play original Gameboy Advance SP cartridges.