Hi. I can't find any previous discussion of this, so here we go. Does anyone know exactly how Churchill tank hulls were constructed? I know that the early Marks were "riveted" and the later ones "welded", but that's about all. Did Vauxhall assemble a frame, then rivet and/or bolt non-armoured (but high-quality) steel plates to that to form a structure - to which they then riveted and/or bolted sheets of armoured steel? (i.e., the method used to make most cruiser tanks up to late 1943-early 1944). Or did they rivet and/or bolt sheets of armoured steel direct to a frame? I take it that the A22F/A42/Mk VII vehicles were welded construction, so have assumed that they consist of sheets of armoured steel welded directly to each other, as this technology was pretty widespread by the time they came along. The reason behind the question is - if Vauxhall DIDN'T build tanks the way the cruiser companies did, what did they know/what equipment did they have that allowed them to do so?