I had some questions regarding reverse engineering locks (physical locks/pin tumblers etc). I'm not sure if they'd qualify as questions here though. Any thoughts from anyone?
I'd think this is perfectly on-topic as per the FAQ. Relevant entry:
hardware analysis and testing
There is not much more to be said. Locks are hardware just like other consumer hardware. We cannot suddenly say it is less hardware than PCBs if this wasn't explicitly ruled out in the first place.
However, you may want to help out on Area51. There is a proposal (just noticed you also commented on that yourself on Ange's answer).
I personally like lock-picking and brainteasers, which are interesting 'physical' forms of reverse engineering, however I'm also feeling it's too different to fit in - it probably requires its own forum.