Regarding joints...I'm not sure if it's the glue that I use, but I've never had a PLA print that I've glued together fail once the CA glue has cured. (I used the brand Mercury Adhesives). I've dropped large items before and for me, the bonding between the PLA layers tends to split with the CA joint surviving. Even if I make a mistake and have to cut apart the glued joint, it bonds so well, that I have PLA missing on one side.
Usually on parts that I have to segment and fit together, I usually design the parts so that I have locator holes, so that I could use brass pins to ensure the two parts line up correctly. If I can't design the parts with locator holes, I drill them in afterwards. I test fit the parts together with the pins and bend them slightly to ensure I get a perfect fit before gluing. On complex pieces it is critical that you get a proper fit. Making a mistake on one joint may create big problems with other pieces you glue on. The pins hold the pieces in place (somewhat) so you can see potential problems with trying to fit subsequent pieces. I would assume that the pins also add a bit of extra strength to the joint as well.
I have a Creality CR-10S with a bed 12x12x18. While this has been a workhorse for my projects, there are times that a larger bed would have helped me out considerably.
TazMan2000