I would try again to install Maya on sdc alongside Julia and this time incorporate the 'no slideshow' fix to see if that makes it install.
Regarding sdc not being set bootable, this 'boot flag' idea is purely windows nonsense, Linux completely ignores these flags.
Can you confirm two things. Is the grub that you have on Julia grub2 or grub legacy? It should be the former. Run
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to find out - if the version starts with 1.something it is grub2.
The second thing is do you boot windows from the Julia grub menu? I am sure you do but I just want to know for certain.
If you have grub2 and you boot windows from the Julia menu then you have no real need to interfere with grub at all, you don't even have to install it on Maya. If you look closely enough during the install process there will be an option to install grub in various places the default being /dev/sda probably. Somewhere in the list of places to install it you should find an option to not install it anywhere - select this option. If you can't find it then select the next safest option which is to install it to the same partition that you are installing Maya on and this will be something like /dev/sdc3 or some other number, but not simply /dev/sdc.
Assuming Maya installs properly reboot into Julia and then run
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This should now display entries for Julia, Maya and Windows but if the install of Maya has failed for any reason it will still display the Julia and Windows entries because the MBR hasn't been touched. This gives a built in measure of safety that overwriting the mbr (the default option) does not.
Once you have done that your grub menu will already have been tidied up a bit so you probably wont have to do it yourself, removing the Maya and swap partition from sda should not be in the least problematic unless you choose the wrong partition to delete - if you do that is your fault and nothing to do with Linux
You mention something about making sdc bootable. Well this can be done, by installing Maya's grub into /dev/sdc but the thing is although you can have as many boot loaders as you like on a hard disk (I have 5 myself) only one of them at a time can actually do the booting, so if you wanted both disks to be bootable you would have to enter the bios on every boot and choose the device you want to use this time - it is not a very good idea imho. There may be some boot manager somewhere that allows you to do this 'on the fly' so to speak but I don't know about it and it would be just another lever of complication to allow things to get screwed up, so personally I would forget that idea.
Hope you work it out anyway.
Edit. I just had a thought about that last paragraph - some computers have a function key (F11, F12 something like that) that allow you to change boot devices without entering the bios, so if you have one of those then you could have both disks bootable I guess.