Depends how far down you need to strip them really- if you can unscrew the parts and unplug them, then you can photograph the process in order to reassemble them. If however you need to de-solder components or open up sealed pieces ( like the potentiometers or switch assemblies ) then I would look at dismantling something less valuable, like some junky old AM radios from ebay that cost a few quid- say a pistol vs stick radio.
I don't think I need to go that far, just so I can see the different parts like the case etc, suggest how they're made and how they compare to the other product... Do you know anywhere I can get an exploded view or anything? That'd really help...