Do the seatstays come together before they meet the seattube? Do you have a detailed shot of that area?
The drawing is not representative of the reality, I cocked up the stays and there was no good reason to attempt to get them any better apart from CAD-training.
Relevant xkcd.
@mdcc_tester: That looks really nice. Do the seatstays come together before they meet the seattube? Do you have a detailed shot of that area?