I don't have a BPSD and I read all if the posts in this thread.
I will answer one if your questions, if you want to change the crystal you will have to send the watch out to be modified by the BPSD master- Adrian. Pretty much most of the good mods for this watch you will have to send the watch out for. If you want a Sea Dweller like the ones you see here, you probably are going to have to send it out to be done for you. Word of caution, some of these builds cost $2000-$3000 and the parts are hard to find. This hobby requires patience. I suggest instead of wanting to jump right in to having a high level modded rep to read for a few months first or you will end up wasting a lot if money buying thing you didn't need or paying way to high of prices for things.
I will answer one if your questions, if you want to change the crystal you will have to send the watch out to be modified by the BPSD master- Adrian. Pretty much most of the good mods for this watch you will have to send the watch out for. If you want a Sea Dweller like the ones you see here, you probably are going to have to send it out to be done for you. Word of caution, some of these builds cost $2000-$3000 and the parts are hard to find. This hobby requires patience. I suggest instead of wanting to jump right in to having a high level modded rep to read for a few months first or you will end up wasting a lot if money buying thing you didn't need or paying way to high of prices for things.