Hi,
I've found a dump of the GCN Prototype of Metroid Prime 3 and i have seen a vid running it on a modified Dolphin revision with extended RAM.
But all download links to this emulator are invalid, now
Separate posts will be created for each code-category so I can use the post's link for easy code sharing. So please don't wonder that there are some double posts by me.
I believe you can change the size of RAM by specifying it on the command line, best if you ask on the dolphin-emu forums (if there is such a thing), or follow the changes that shuffle2 made in a branch specifically made for extending MEM1.