The vampire coffin making industry must be insane. You can’t go to a human carpenter for that. No human person needs a guaranteed light sealed coffin that can open from the inside. They also probably drop way more money than is reasonable into these things, it’s not like a vampire is gonna wanna replace their coffin every century or be caught dead in a shabby cheap one, but humans make coffins to be viewed exactly once, comfort not a factor, and then nailed shut and buried in the ground. Completely different goals
Anyway all this to say I am a carpenter, vampire-friendly, and I use the utmost discretion in conducting my business