You might be interested to check these links where they have posted pre built
coreboot binaries for Acer C7. And some users have tested by flashing their
C7s..
Read the comments, those are more informative..
## Binaries here
http://johnlewis.ie/pre-built-coreboot-firmware-for-chromebooks/
##Read the comments here, Kyle Brown was able to boot other linux and windows
too I guess..
http://johnlewis.ie/compiling-your-own-coreboot-firmware-for-the-samsung-series-5-550-chromebook/
##The main blog(Thank him, as he is helping the chromebook community)-
http://johnlewis.ie/
PS- John is looking to purchase a new C7 instead of importing one from others
as the customs are too high in his place, so donate money if possible... else
if you live in EU, you can ship your C7 to him free of cost..
Or spread the word to other chromebook users..
Cheers!