Drawn on the plot, then built through the drawing

Build one interactive web page: Scrolling draws an architect's front elevation onto an empty plot, the pen moving along every line, then builds the house up through the drawing the way a house goes up: brick in courses, the cladding a board at a time, slates from the eaves to the ridge, then the glazing, the drive and the lawn. Wherever the pointer rests, the drawing rises back through whatever stage the build has reached.

Set it on an invented business called Sampleton, with its own drawn or generated pictures and no one else's files. It suits: A new build or a development: a plot with planning, a self-build, a housebuilder's show home, an extension. Anything whose story is drawing, then making. Do not let it fail the way this kind of piece usually does: A drawing that does not match the building, or a render passed off as built. Here every line is measured off the built picture, so the elevation lands on the house it describes; a 'Visualisation' label shows whenever the house is on screen; and the neighbours and the street never change, because only the plot is ever replaced.

It must work with the keyboard, on a phone, with reduced motion respected and no text under 12px. Tell me which libraries you chose and why.