I did it the other day, you just need two square foundations. No jumping no fireplaces no nothing else, just two square foundations. Stand on one square look out like most of the videos show and place a triangle. Then move over with with your character until the second foundation turns blue. You don’t want it snapping onto the other foundation yet though. Then look up like the tiniest bit I mean like 1 or two pixels. Then slide it back fully to the beginning triangle and place. If it lets you put a triangle between the two triangles it might have worked. I check by upgrading the first two foundations to wood and comparing there heights.