Damn fine job on your box man!
I built this one for less then 100 not much to look at but funtional and strong built in heat lamp and fan with dimmer control. The box is insulated i use compressed steel for the cat walk floor ( diamond grate ) very strong and the holes are small enough that 5 week old pups feet wont get caught in them. Double pane plexy glass viewing window so you can check on mama and pups without disturbing them. Only down side it can never be moved that box is ridiculously heavy.
The day i finished
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Night shot
A litter of happy warm pups
RoughNeck