Don't be too envious, gumby, my friend.
[Edit: With "Island of Secrets", I actually happen to have the book in PDF format. The creative work has already been done. The monsters, places, map, quest, clues and information has already been laid out. The illustrations have been done. You're actually doing a lot more creative work and research than me]
As it happens, I work in medical research and am facing a huge bunch of paid downtime. Not the one to lay down and vacation or whatever, I decided to put a lot of my creative energy into this. But that's a different topic altogether.
Point is, in the five days of work, I put together five rooms. That's about seven hours on a room. That is a lot of work. I still have to work with script files. This is a big undertaking. It's huge. And not everyone is in my position.
All this needs is dedication! Make the Zork happen! I want to see the fruits of that undertaking!