Well, obviously, I am making headway in ds's old room. HUGE garbage bag is sitting at the road right now, along with several smaller ones which were included in the trash compactor bag. (Usually that is the only trash bag we have, but this week -- and several more, I'd suspect -- will include the extra bag from this excavation.
The plan is to get thick shelving boards and maybe concrete blocks to support the weight of shelves loaded w/record albums. DS says HIS plan was/is to do this at his house and transfer records over there. I know that is not really going to be the most beautiful way to house this collection, but it seems to be the sturdiest method. Built in cabinets would be really nice... but alas, we have not won the lottery lately.
Re: ds's idea to take records to his house... I'm really thinking the bulk of this collection should stay here, where there IS ample space, if we only use it wisely. Ddil said she had already informed him that when/if a child comes along, his Man-Cave/Music Room at their house will cease to exist.

And she did tell me she does not like to even go in there now. She wants a computer of her own. She said it's not that it is so terribly cluttered, it's just that it's small, and it has all his stuff in there, and she just feels claustrophobic in it. (We could have -- and DID -- tell them, the medium/dark blue paint in this small space would have that effect... but you know... live & learn.)