Welcome to Geekhack. Congrats on making the choice. I hope you enjoy your more tactile, clicky keys. I know you already bought the Filco and truly back lighting is unnecessary (for touch typists or people willing to use lights), but there is just as Aug first, a backlit blue cherry board.
You don't need a roof, since it comes with a plastic cover that keeps stuff out better than a roof would. Roofs might look nicer, but that's it. I pop the plastic back on my Filco, whenever I stop typing.
For the most part, you'll probably be able to get by a long time without stripping your keyboard of its housing and keys for a spring cleaning. Popping some keys off is nothing. Making it naked with all keys off, is more than I want to do, unless necessary. Basically, if I pop a key off and see anything scary, then I'll probably give it a good cleaning, but that hopefully is still a long way off. Probably major cleaning once a year will be sufficient if you wash before typing, don't drop food and drink in it, etc. Once a month if you're a worry-wart. I don't particularly recommend it, especially with the keys on, but some people shake theirs out once a week.
At work, I'm already concerned about what's in that cherry keyboard and its considerably younger than my Filco. Maybe I should put it in its cardboard each night. I used to turn over my silicon board over a trash can once a week and wash it once a month, but it was a washable keyboard.
