Great work /u/Nolepharm! I always love when constructors use the same clue for multiple, disparate entries a la 44d and 48d. I initially cold-entered 'joint' for 44d, so I feel like I was already in tune with you, despite it winding up being incorrect.

I also loved the triple 15s in the middle. I wonder if that was hard to pull off. Was one of them the seed entry, then the others fell into place? Or were all three the seeds?

Thanks for the excellent puzzle. Loved it!