I applaud you for taking on this quilt!!! Many may say 'it's too difficult' however I knew a woman who chose what most quilters might say was a 'difficult' quilt - - New York Beauty - - and she managed just fine mostly because no one told her it was difficult. She just did it. So I say, just stick to it and do it.
Also, consider getting an acrylic template. I know Creative Grids makes one as well as other mfrs.
This will give you the 'notch' you need to line your triangles up and get that 1/4" allowance. I say go for it and be sure to show us pictures so we can cheer you on!!