I get the impression that either the OP is writing a book or is fairly new to firearms and is just asking questions. However I don't think he's ever crossed the line into troll status so most of his questions run into a couple pages because as a rule we seem to be a tolerant and obliging group.
For what it's worth here's my burial plans. I spent 5 1/2 in a field artillery Battery that started out with 105mm towed howitzers and switched over to 155's. As a 105mm Battery we occasionally used our guns to fire back-up when orchestras performed the 1812 Overture.
After the last event that our Battery provided the back-up I kept one of the fired casings. 105mm blank casings are brass,around 110mm in diameter and around 200 mm tall. I polished the casing up, turned a walnut plug for the top, soldered my old Unit Crest to the side of it and had my name, DOB, Unit, and DOS engraved on it.
I told my wife that if I hit room temperature before her have me cremated, engrave the DOD on the casing,sell up the plug, and stick me on the piano until she joins me. At that point either slip me into her casket or or slip her ashes in with mine and plant us both in the cemetery with a suitable stone.
I told her that if she decides to remarry and does not want to be buried with me then give the shell casing to whichever of the kids she happens to be the most aggravated with as a Christmas Present.