Wow. Nice beer cellar Nicholas. I’d be hard pressed to think of one that I have seen that comes close to being as sweet as yours.
I do an annual beer trip to Amsterdam with some old college budies- this year Nov. 8-11th. I bring my own containers to haul beer back (mostly gueuze and Dutch rarities like de Molen) so I usually have room to bring some bombers over if you are interested in giving that cellar a little American feel.
I store them upright. That is the correct way, and I have been aging beer for close to 10 years, so I know they turn out A-OK. I just generally keep them in cardboard boxes, although crates is a very good idea, and I will hunt down some as those will stack much better.
I should add that I consider ANY beer that is bottle conditioned to be a goo candidate for aging. So, anything that has yeast in the bottle, fermented in the bottle, etc., is a good candidate. Especially if it is cork finished.
Also, I might add that I will be in Brussels in July 2014 for the big international beer event. Expect a knock on your door.
I’ve read (heard?) that cork-finished bottles of beer should be stored on their sides; crown-caps should be stored standing up. Don’t know if that’s correct, but that’s how I store my beers.
Its my opinion that you store beers upright to allow the lees to settle neatly into the base of the bottle. This way you can have a clean first pour with no lees and if you so desire you can shake up the lees and have a second glass with lees.
Other than that I do not know of any reason to store bottles in any specific sense.
Different people say different things, but most of the Champagne experts store theirs upright. I see no difference between a cork finished beer with or without the crown cap personally. All of mine get stored upright as a result. I’m no expert, but at least I can say I have not run into problems so far.