Yes, we use recycled windows! For cold frames as well as the greenhouse and we're looking around for some to put in the house (I've got all single pane-40+ yrs old)
We used camper windows in my greenhouse and the aluminum from the trailer siding became roofing for the coop and part of the woodshed.
We also used bits of it to rat-proof the base of the coop.
But we still have a rat

It eats more than the chickens do!
We also recycle vehicles, my potting shed is a 1965 Mercedes cargo van!
Lots of room in it and it has two sky-lights, we've got to build a roof over it because it leaks, then we're going to rebuild the inside of it and I'll have a vintage vehicle potting shed!
Not something I can take to a car show as the motor is seized, but very useful.
Right now its storage for the 1001 things we don't have room for anywhere else.
My house is only 660 sq.ft. so theres not a lot of storage.
I've got a good scrounging vehicle too, a 1987 Dodge Caravan that igot for FREE
What do you scrounge besides pallets? Other than lumber we mostly scrounge around for wire and garen supplies.
Take Care
Lois