Teardrops n Tiny Travel Trailers

Hi - I am new to the forum although I've been reading multiple posts. I am currently trying to figure out a concern with the profile on the back part of the wall on the generic Benroy plans where the wall drops down. I made the two beam compasses and I have carefully measured their lengths as well as the location of marking the outlines they make. At no point do the two compass lines intersect and it would seem that they should. For what it is worth the plans seem to show that the 48" compass line starts at the base 41 9/16 from the back at the base of the wall and the 19" compass line starts 19" from the back and 18 5/32" from the base. I thought I should include this information in case I have misread something. In any case something is wrong and it has me stumped. Any suggestions from anyone?

I had the same issue but just played around until it looked right to me.
There is no right or wrong and wont effe t anything,just do what suits you