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@M_V
Hmmm, obviously it's best to tell others to err on the side of caution lest you be blamed if things do go awry but IF THEY WERE MY RIMS the rust wouldn't bother me, I've seen much worse.
The gap may close up as they are built, I've seen similar gaps disappear once the rim is built into a wheel. Maybe ask in the wheelbuilding thread. If you have spokes and hubs handy then it'd certainly be worth a try. If you'll have to spend money in order to build them, maybe not worth the gamble.
The scratch/gouge...doesn't look too bad. Is the bike for the track or road? If road, how many brakes are you using? Could you put the gouged rim on the back where you wouldn't have to worry about it interfering with the brake? Or you could lightly sand/file it down a bit and use it on a braked wheel. Since the brake is going to strip the anodised finish off the rim anyway you might be able to sort of hide the scratch that way?