I'm interested in this, the trouble with silent auctions is that as a bidder I've no idea what's been bid which means there is no guarantee that the winning bid actually gets the machine.  For example if it ends with the 1 bid you already have and that's only 0.1BTC you are obviously not going to let it go at that price (and I don't blame you)

If you want to PM me what you consider 'reasonable' to end early, if it matches up with what I consider reasonable I can collect this tonight

Anyway free bump, and good luck.