Can a whole range (52cm-62cm, for example) of frame sizes be built using the same set of lugs?
ISTM that increasing the front triangle size will require one of two "solutions" since the front triangle's tube angles are fixed by the lugs. For example, if I built up a 56x56cm (seat tube x top tube length) with a set of lugs that gave me a bike with 73 degree seat and head tubes when using a fork with 400mm axle to crown height, then used the same set of lugs to build a 62x62cm frame and used the same 400mm for, the 62cm frame would have a lower bottom bracket and steeper seat and head tube angles due to the front triangle being relatively "tilted" forward.
Am I making sense here? Is this just the way things work when building frames with lugs? Or am I missing some nugget of framebuilding whereby the front triangle's tubes relative angles are not "set in stone" by the lugs?