I'm basically done populating my boards.
How critical are C10, C11, C12? I couldn't find the MKS2 Wimas listed in the BOM. The next shipment is going to be in late April! I can't wait nearly 5 months for caps to come in! First world problems! LOL.
FWIW, I used Vishay/Roederstein MKT1813 polyester axials on their sides. Specifically, MKT1813447065: https://www.mouser.com/ProductDetail/75-MKT1813447065
OK to use?
Definitely no problem at all.
The only thing that's really critical in these units is the matching of Q10 and Q14... those have to be very tightly matched with each other, and if building a stereo unit, all four have to be very closely matched.