Leo, I'd say the opening I'd need would only be about three times the width of a standard letterbox, would this still need the heavy rails you mentioned?
I dont suppose you could use a modified catflap? I presume these are lockable.
you would have to have a collection box on the otherside of the door, i wouldn't fancy leaving a big flap unlocked when i'm out, at work. this would mean the door would have to be strong enough to hold a box on the inside and not be compromised by a large letter box.
I would think so, you wouldn't be left with much to support the structure of the door at that rate. Anyone in the business of making doors should be able to advise what you can get away with.
Leo
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