I like it DC!
I suspect this will outlast a plywood design by a factor of 2 or more. I can see instances where the plywood designs would be good (low cost swarm traps), but for a nuc I prefer something more weather resistant like your design.
I like the idea of more space in a nuc so you can stick in a feeder. Are those frame feeders with bee ladders working well for you? Do you like them better than other options like quart jars or the plastic nuc top feeders?