I doubt that its possible to gain muscle on only 10% protein.
I had two friends that went on the 80:10:10 diet where you eat 80% carbs, 10% fat and 10% protein, and its completely raw and vegan.
They were eating constantly and were constantly hungry because they had to strictly limit the amount of nuts, seeds, and other protein and energy foods they could eat because it would easily put the balance out.
They followed the diet strictly but lost so much weight and became so weak they had to stop.
Also the numbers in this diet don't add up because vegetables are not calorie-free.
If they were calorie free, you would either be eating non-stop to consume adequate veggies to maintain the balance so you eat enough fat, protein, and carb, if you get me, or you'd be on a rapid weight loss diet which would result in muscle deterioration.
In my opinion (as a nutritionist student), this seems like a fad diet.
Also, all vegan food sources have some carbs with protein, so this wouldn't work either.
Sorry if I'm being too critical but this diet just looks suspicious to me.
There is some sensible information here that will get you off to a good start: http://www.veganbodybuilding.org/main.htm
Welcome to the forum by the way, I hope you find it supportive, helpful and interesting.