Do it! Over time, I think you would become familiar with the angles instinctively, and your measurements would serve anyone learning. Wdyt?  

 Instinct is the only way to shoot my bow. There's no sites to align or anything. Very hard to aim the further out you go 

 Gapping w the shaft, or the gap at the riser are my preferred methods depending on distance.  https://charlesarcheryblog.wordpress.com/2012/06/21/various-methods-of-aiming-the-traditional-bow/