Large Scale Central

House Entry

I am looking for input on how some of you folks provided a door for the trains to enter your houses. I’m looking for something fairly tight to prevent bugs and such when closed.
Did you build your own? Has anyone considered electronic cat doors? They seem a little pricey, but may be a good idea. What sort of mechanisms have been used to open the doors…levers, switches, electical, pnuematic, purely manual? Anyone have pictures or descriptions of how they did this?

Thanks for all the good information and advice in advance.
Mike