That’s a nice compact PCB layout, I like it.
I did initially build it on strip board to test heat sinks. In testing a small heatsink, and cycling between 1.2 amps and 0.2amps at 14.6V, I was getting temperatures of around 80c. Graphs for the small heatsink test below.
I was attempting to simulate a worse case FT8 scenario. There was a quite a difference temperature wise, between 14.6V and 13.8V. I also added a 2amp slow blow PCB fuse on the output, as having no integral protection didn’t sit well with me.
Talking of rabbit holes, my case just kept getting bigger until I got heatsink I was happy with 
